Physics · NEET, JEE Main

Waves

142 practice questions with a worked solution for each. Tap an option to see instantly if you are right.

103MCQ39Numerical4With diagram
Start with question 1 See it move: Standing waves on a stringSee it move: Doppler effect in sound & sonic boom
  1. 1An open organ pipe of length LL vibrates in its fundamental mode. The wavelength of the sound wave produced is:NEET/MCQ/Medium
  2. 2A string of length LL fixed at both ends vibrates in its second overtone (3rd harmonic). The number of nodes in the standing wave is:JEE Main/MCQ/Medium
  3. 3A siren emitting frequency f=1000 Hzf = 1000\,\text{Hz} approaches a stationary listener with speed 34 m/s34\,\text{m/s} (speed of sound v=340 m/sv=340\,\text{m/s}). Observed frequency is:JEE Main/MCQ/Medium
  4. 4Two strings (A,B)(A, B) having linear densities μA=2×10−4 kg/m\mu_{A}=2 \times 10^{-4} \mathrm{~kg} / \mathrm{m} and, μB=4×10−4 kg/m\mu_{B}=4 \times 10^{-4} \mathrm{~kg} / \mathrm{m} and lengths LA=2.5 mL_{A}=2.5 \mathrm{~m} and LB=1.5 mL_{B}=1.5 \mathrm{~m} respectively are joined. Free ends of AA and BB are tied to two rigid supports CC and DD, respectively creating a tension of 500 N in the wire. Two identical pulses, sent from CC and DD ends, take time t1t_{1} and t2t_{2}, respectively, to reach the joint. The ratio t1/t2t_{1} / t_{2} is :JEE Main/MCQ/Medium/Basics of Mechanical Waves
  5. 5The equation of wave is given by Y=10−2sin⁡2π(160t−0.5x+π4)Y={10}^{-2}\sin 2\pi \left(160t-0.5x+\dfrac{\pi }{4}\right), where xx and YY are in mm and tt in ss. The speed of the wave is _______ kmh−1km{h}^{-1}.JEE Main/Numerical/Medium/Basics of Mechanical Waves
  6. 6A transverse harmonic wave on a string is given by y(x,t)=5sin⁡(6t+0.003x)y\left(x,t\right)=5\sin \left(6t+0.003x\right) where xx and yy are in cmcm and tt in sec⁡\sec. The wave velocity is _________ ms−1m{s}^{-1}.JEE Main/Numerical/Medium/Basics of Mechanical Waves
  7. 7A steel wire with mass per unit length 7.0×10–3kgm–17.0\times {10}^{–3}kg{m}^{–1} is under tension of 70N70N. The speed of transverse waves in the wire will be:JEE Main/MCQ/Medium/Basics of Mechanical Waves
  8. 8In the wave equation y=0.5sin⁡2πλ(400t−x)my=0.5\sin \dfrac{2\pi }{\lambda }\left(400t-x\right)m the velocity of the wave will be :JEE Main/MCQ/Medium/Basics of Mechanical Waves
  9. 9A transverse wave is represented by y=2sin⁡(ωt−kx)cmy=2\sin \left(\omega t-kx\right)cm. The value of wavelength (in cmcm) for which the wave velocity becomes equal to the maximum particle velocity, will beJEE Main/MCQ/Medium/Basics of Mechanical Waves
  10. 10A longitudinal wave is represented by y=10sin⁡2π(nt−xλ)cmy=10\sin 2\pi \left(nt-\dfrac{x}{\lambda }\right)cm. The maximum particle velocity will be four times the wave velocity if the determined value of wavelength is equal toJEE Main/MCQ/Medium/Basics of Mechanical Waves
  11. 11Two waves are simultaneously passing through a string and their equations are : y1=A1sin⁡k(x−vt),y2=A2sin⁡k(x−vt+x0).{y}_{1}={A}_{1}\sin k(x-vt),{y}_{2}={A}_{2}\sin k\left(x-vt+{x}_{0}\right). Given amplitudes A1=12mm{A}_{1}=12mm and A2=5mm{A}_{2}=5mm, x0=3.5cm{x}_{0}=3.5cm and wave number k=6.28cm−1.k=6.28{cm}^{-1}. The amplitude of resulting wave will be _____ mm.mm.JEE Main/Numerical/Medium/Basics of Mechanical Waves
  12. 12A 25m25m long antenna is mounted on an antenna tower. The height of the antenna tower is 75m75m. The wavelength (in meter) of the signal transmitted by this antenna would be :JEE Main/MCQ/Medium/Basics of Mechanical Waves
  13. 13The mass per unit length of a uniform wire is 0.135gcm−10.135g{cm}^{-1}. A transverse wave of the form y=−0.21sin⁡(x+30t)y=-0.21\sin \left(x+30t\right) is produced in it, where xx is in meter and tt is in second. Then, the expected value of tension in the wire is x×10−2Nx\times {10}^{-2}N. Value of xx is (Round-off to the nearest integer)JEE Main/Numerical/Medium/Basics of Mechanical Waves
  14. 14The percentage increase in the speed of transverse waves produced in a stretched string if the tension is increased by 44%, will be ___ %.JEE Main/Numerical/Medium/Basics of Mechanical Waves
  15. 15Assume that the displacement (s) of air is proportional to the pressure difference (Δp)\left(\Delta p\right) created by a sound wave. Displacement (s) further depends on the speed of sound (v), density of air(ρ)\left(\rho \right) and the frequency (f). If Δp 10Pa,n 300m/s,p 1kg/m3\Delta p~10Pa,n~300m/s,p~1kg/{m}^{3} f 1000Hzf~1000Hz, then s will be of the order of (take the multiplicative constant to be 1 )JEE Main/MCQ/Medium/Basics of Mechanical Waves
  16. 16A uniform thin rope of length 12m12m and mass 6kg6kg hangs vertically from a rigid support and a block of mass 2kg2kg is attached to its free end. A transverse short wave train of wavelength 6cm6cm is produced at the lower and the rope. What is the wavelength of the wave train (in cmcm ) when it reaches the top of the rope?JEE Main/MCQ/Medium/Basics of Mechanical Waves
  17. 17A transverse wave travels on a taut steel wire with a velocity of vv when tension in it is 2.06×104N.2.06\times {10}^{4}N. When the tension is changed to T,T, the velocity changed to v2.\dfrac{v}{2}. The value of TT is close to:JEE Main/MCQ/Medium/Basics of Mechanical Waves
  18. 18Equation of travelling wave on a stretched string of linear density 5 g/m5 \mathrm{~g} / \mathrm{m} is y=0.03sin⁡(450t−9x)\mathrm{y}=0.03 \sin (450 \mathrm{t}-9 \mathrm{x}) where distance and time are measured in SI units. The tension in the string is:JEE Main/MCQ/Medium/Basics of Mechanical Waves
  19. 19A string of length 1m1m and mass 5g5g is fixed at both ends. The tension in the string is 8.0N8.0N. The string is set into vibration using an external vibrator of frequency 100Hz100Hz. The separation between successive nodes on the string is close toJEE Main/MCQ/Medium/Basics of Mechanical Waves
  20. 20In a transverse wave the distance between a crest and neighbouring trough at the same instant is 4.0 cm4.0 \mathrm{~cm} and the distance between a crest and trough at the same place is 1.0 cm1.0 \mathrm{~cm}. The next crest appears at the same place after a time interval of 0.4 s0.4 \mathrm{~s}. The maximum speed of the vibrating particles in the medium is:JEE Main/MCQ/Medium/Basics of Mechanical Waves
  21. 21The transverse displacement y(x,t)y(x, t) of a wave on a string is given by y(x,t)=e−(ax2+bt2+2abxt)y(x, t)=e^{-\left(a x^2+b t^2+2 \sqrt{a b} x t\right)}. This represents aJEE Main/MCQ/Medium/Basics of Mechanical Waves
  22. 22A transverse wave on a string is described by y=3sin⁡(36t+0.018x+π/4)y = 3\sin(36t + 0.018x + \pi/4), where x,yx, y are in cm and tt in seconds. The least distance between the two successive crests in the wave is _____ cm. (Nearest integer)
    (    π=3.14\pi = 3.14)    JEE Main/Numerical/Medium/Travelling Waves
  23. 23The equation of a plane progressive wave is given by y=5cos⁡π(200t−x150)y = 5\cos\pi\left(200t - \dfrac{x}{150}\right) where xx and yy are in cm and tt is in second. The velocity of the wave is _______ m/s.JEE Main/MCQ/Medium/Travelling Waves
  24. 24A point source is kept at the center of a spherically enclosed detector. If the volume of the detector increased by 8 times, the intensity willJEE Main/MCQ/Medium/Travelling Waves
  25. 25The equation of a wave travelling on a string is y=sin⁡[20πx+10πt]\mathrm{y}=\sin [20 \pi \mathrm{x}+10 \pi \mathrm{t}], where x and t are distance and time in SI units. The minimum distance between two points having the same oscillating speed is :JEE Main/MCQ/Medium/Travelling Waves
  26. 26Displacement of a wave is expressed as x(t)=5cos⁡(628t+π2)mx(t)=5 \cos \left(628 t+\frac{\pi}{2}\right) m. The wavelength of the wave when its velocity is 300 m/s300 \mathrm{~m} / \mathrm{s} is :JEE Main/MCQ/Medium/Travelling Waves
  27. 27A sinusoidal wave of wavelength 7.5 cm travels a distance of 1.2 cm along the x -direction in 0.3 sec. The crest PP is at x=0x=0 at t=0sect=0 \mathrm{sec} and maximum displacement of the wave is 2 cm. Which equation correctly represents this wave ?JEE Main/MCQ/Medium/Travelling Waves
  28. 28The equation of a transverse wave travelling along a string is y(x,t)=4.0sin⁡[20×10−3x+600t]mmy(x, t)=4.0 \sin \left[20 \times 10^{-3} x+600 t\right] \mathrm{mm}, where xx is in mm and tt is in second. The velocity of the wave is :JEE Main/MCQ/Medium/Travelling Waves
  29. 29A plane progressive wave is given by y=2cos⁡2π(330t−x)my=2 \cos 2 \pi(330 \mathrm{t}-x) \mathrm{m}. The frequency of the wave is :JEE Main/MCQ/Medium/Travelling Waves
  30. 30A point source is emitting sound waves of intensity 16×10−8Wm−216\times {10}^{-8}W{m}^{-2} at the origin. The difference in intensity (magnitude only) at two points located at a distances of 2m2m and 4m4m from the origin respectively will be ________×10−8Wm−2\times {10}^{-8}W{m}^{-2}.JEE Main/Numerical/Medium/Travelling Waves
  31. 31Match List I with List II List I List II A Troposphere I Approximate 65−75km65-75km over Earth’s surface B E-Part of Stratosphere II Approximate 300km300km over Earth’s surface C F2{F}_{2}-Part of Thermosphere III Approximate 10km10km over Earth’s surface D D-Part of Stratosphere IV Approximate 100km100km over Earth’s surface Choose the correct answer from the options given below :JEE Main/MCQ/Medium/Travelling Waves
  32. 32The distance between two consecutive points with phase difference of 60∘60^{\circ} in a wave of frequency 500Hz500Hz is 6.0m6.0m. The velocity with which wave is travelling is ______ kms−1km{s}^{-1}.JEE Main/Numerical/Medium/Travelling Waves
  33. 33A travelling wave is described by the equation y(x,t)=[0.05sin⁡(8x−4t)]my\left(x,t\right)=\left[0.05\sin \left(8x-4t\right)\right]m. The velocity of the wave is:
    [All the quantities are in SI unit]    JEE Main/MCQ/Medium/Travelling Waves
  34. 34Two travelling waves of equal amplitudes and equal frequencies move in opposite directions along a string. They interfere to produce a stationary wave whose equation is given by y=(10cos⁡πxsin⁡2πtT)cmy=\left(10\cos \pi x\sin \dfrac{2\pi t}{T}\right)cm. The amplitude of the particle at x=43cmx=\dfrac{4}{3}cm will be _____ cm.cm.JEE Main/Numerical/Medium/Travelling Waves
  35. 35Two travelling waves produces a standing wave represented by equation. y=(1.0mm)cos⁡[(1.57cm−1)x]sin⁡[(78.5s−1)t]y=\left(1.0mm\right)\cos \left[\left(1.57{cm}^{-1}\right)x\right]\sin \left[\left(78.5{s}^{-1}\right)t\right]. The node closest to the origin in the region x>0x\gt 0 will be at x=......(incm).x=......\left(\text{in}cm\right).JEE Main/Numerical/Medium/Travelling Waves
  36. 36A sound wave of frequency 245Hz245Hz travels with the speed of 300ms−1300{ms}^{-1} along the positive x-axis. Each point of the wave moves to and fro through a total distance of 6cm6cm. What will be the mathematical expression of this travelling wave?JEE Main/MCQ/Medium/Travelling Waves
  37. 37Which of the following equations represents a travelling wave?JEE Main/MCQ/Medium/Travelling Waves
  38. 38For a transvers wave travelling, along a straight line, the distance between two peaks (crests) is 5m5\text{m}, while the distance between one crest and one trough is 1.5m1.5\text{m}. The possible wavelengths (in m\text{m}) of the waves are:JEE Main/MCQ/Medium/Travelling Waves
  39. 39A progressive wave travelling along the positive x−x- direction is represented by y(x,t)=Asin(kx−ωt+ϕ)y\left(x,t\right)=Asin(kx-\omega t+\phi ) . Its snapshot at t=0t=0 is given in the figure.

    For this wave, the phase     ϕ\phi is:    JEE Main/MCQ/Medium/Travelling Waves/With diagram
  40. 40A travelling harmonic wave is represented by the equation y(x,t)=10−3sin⁡(50t+2x),y\left(x,t\right)={10}^{-3}\sin \left(50t+2x\right)\text{,} where xx and yy are in meter and tt is in seconds. Which of the following is a correct statement about the wave?JEE Main/MCQ/Medium/Travelling Waves
  41. 41A granite rod of 60cm60cm length is clamped at its middle point and is set into longitudinal vibrations. The density of granite is 2.7×103kgm−32.7\times {10}^{3}kg{m}^{-3} and its Young's modulus is 9.27×1010Pa9.27\times {10}^{10}Pa. What will be the fundamental frequency of the longitudinal vibrations?JEE Main/MCQ/Medium/Travelling Waves
  42. 42A standing wave is formed by the superposition of two waves travelling in opposite directions. The transverse displacement is given by, y(x,t)=0.5sin⁡⁡(5π4x)cos⁡⁡(200πt)y\left(x,t\right)=0.5\sin ⁡\left(\dfrac{5\pi }{4}x\right)\cos ⁡\left(200\pi t\right). What is the speed of the travelling wave moving in the positive xx direction? (xx and ttare in meter and second, respectively)JEE Main/MCQ/Medium/Travelling Waves
  43. 43A transverse wave is represented by : y=10πsin(2πTt−2πλx)\text{y}=\dfrac{10}{\pi }sin\left(\dfrac{2\pi }{\text{T}}\text{t}-\dfrac{2\pi }{\lambda }\text{x}\right) For what value of the wavelength the wave velocity is twice the maximum particle velocity?JEE Main/MCQ/Medium/Travelling Waves
  44. 44The disturbance y(x,t)y(x, t) of a wave propagating in the positive xx-direction is given by y=11+x2y=\frac{1}{1+x^2} at time t=0t=0 and by y=1[1+(x−12)]y=\frac{1}{\left[1+\left(x-1^2\right)\right]} at t=2 st=2 \mathrm{~s}, where xx and yy are in meters. The shape of the wave disturbance does not change during the propagation. The velocity of wave in m/s\mathrm{m} / \mathrm{s} isJEE Main/MCQ/Medium/Travelling Waves
  45. 45A wave travelling along the xx-axis is described by the equation y(x,t)=0.005cos⁡(αx−βt)y(x, t)=0.005 \cos (\alpha x-\beta t). If the wavelength and the time period of the wave are 0.08 m0.08 \mathrm{~m} and 2.0 s2.0 \mathrm{~s}, respectively, then α\alpha and β\beta in appropriate units areJEE Main/MCQ/Medium/Travelling Waves
  46. 46The displacement y of a particle in a medium can be expressed as y=10−6sin⁡(110t+20x+π/4)my=10^{-6} \sin (110 t+20 x+\pi / 4) m, where tt is in seconds and xx in meter. The speed of the wave isJEE Main/MCQ/Medium/Travelling Waves
  47. 47The displacement yy of a wave travelling in the xx-direction is given by y=10−4sin⁡(600t−2x+π3)y=10^{-4} \sin \left(600 t-2 x+\frac{\pi}{3}\right) metres where x\mathrm{x} is expressed in metres and t\mathrm{t} in seconds. The speed of the wave-motion, in ms−1\mathrm{ms}^{-1}, isJEE Main/MCQ/Medium/Travelling Waves
  48. 48When temperature increases, the frequency of a tuning forkJEE Main/MCQ/Medium/Travelling Waves
  49. 49Two loudspeakers (L1L_{1} and L2L_{2}) are placed with a separation of 10 m, as shown in figure. Both speakers are fed with an audio input signal of same frequency with constant volume. A voice recorder, initially at point AA, at equidistance to both loud speakers, is moved by 25 m along the line ABA B while monitoring the audio signal. The measured signal was found to undergo 10 cycles of minima and maxima during the movement. The frequency of the input signal is ____\_\_\_\_ Hz (Speed of sound in air is 324 m/s324 \mathrm{~m} / \mathrm{s} and 5=2.23\sqrt{5}=2.23)
    JEE Main/Numerical/Medium/Interference and Superposition of Waves/With diagram
  50. 50The displacement equations of two interfering waves are given by y1=10sin⁡(ωt+π3)cm{y}_{1}=10\sin \left(\omega t+\dfrac{\pi }{3}\right)cm, y2=5[sin⁡(ωt)+3cos⁡ωt]cm{y}_{2}=5\left[\sin \left(\omega t\right)+\sqrt{3}\cos \omega t\right]cm respectively. The amplitude of the resultant wave is _____ cmcm.JEE Main/Numerical/Medium/Interference and Superposition of Waves
  51. 51Two light beams of intensities 4I4I and 9I9I interfere on a screen. The phase difference between these beams on the screen at point AA is zero and at point BB is π\pi. The difference of resultant intensities, at the point AA and BB, will be _____ II.JEE Main/Numerical/Medium/Interference and Superposition of Waves
  52. 52If a wave gets refracted into a denser medium, then which of the following is true?JEE Main/MCQ/Medium/Interference and Superposition of Waves
  53. 53Two light beams of intensities in the ratio of 9:49:4 are allowed to interfere. The ratio of the intensity of maxima and minima will be :JEE Main/MCQ/Medium/Interference and Superposition of Waves
  54. 54The equations of two waves are given by :
    y1=5sin⁡2π(x−vt)cm{y}_{1}=5\sin 2\pi \left(x-vt\right)cm
    y2=3sin⁡2π(x−vt+1.5)cm{y}_{2}=3\sin 2\pi \left(x-vt+1.5\right)cm
    These waves are simultaneously passing through a string. The amplitude of the resulting wave is :    JEE Main/MCQ/Medium/Interference and Superposition of Waves
  55. 55Three harmonic waves having equal frequency vv and same intensity I0{I}_{0} , have phase angles 0,π40,\dfrac{\pi }{4} and −π4-\dfrac{\pi }{4} respectively. When they are superimposed the intensity of the resultant wave is close to:JEE Main/MCQ/Medium/Interference and Superposition of Waves
  56. 56A wave represented by the equation y1=acos⁡y_1=a \cos (kx−ωt)(k x-\omega t) is superimposed with another wave to form a stationary wave such that the point x−0x-0 is node. The equation for the other wave isJEE Main/MCQ/Medium/Interference and Superposition of Waves
  57. 57Following are expressions for four plane simple harmonic waves
    (i)     y1=Acos⁡2π(n1t+xλ1)\quad y_1=A \cos 2 \pi\left(n_1 t+\frac{x}{\lambda_1}\right)
    (ii)     y2=Acos⁡2π(n1t+xλ1+π)y_2=A \cos 2 \pi\left(n_1 t+\frac{x}{\lambda_1}+\pi\right)
    (iii)     y3=Acos⁡2π(n2t+xλ2)y_3=A \cos 2 \pi\left(n_2 t+\frac{x}{\lambda_2}\right)
    (iv)     y4=Acos⁡2π(n2t−xλ2)y_4=A \cos 2 \pi\left(n_2 t-\frac{x}{\lambda_2}\right)
    The pairs of waves which will produce destructive interference and stationary waves respectively in a medium, are    JEE Main/MCQ/Medium/Interference and Superposition of Waves
  58. 58A wave y=asin⁡(ωt−kx)y=a \sin (\omega t-k x) on a string meets with another wave producing a node at x=0x=0. Then the equation of the unknown wave isJEE Main/MCQ/Medium/Interference and Superposition of Waves
  59. 59A string is clamped at both the ends and it is vibrating in its 4th{4}^{th} harmonic. The equation of the stationary wave is y=0.3sin⁡⁡(0.157x)cos(200πt)y=0.3\sin ⁡\left(0.157x\right)cos(200\pi t). The length of the string is
    (All quantities are in     SISI units.)    JEE Main/MCQ/Medium/Stationary waves
  60. 60Two wires W1{W}_{1} and W2{W}_{2} have the same radius rrand respective, densities ρ1{\rho }_{1} and ρ2{\rho }_{2}, such that ρ2=4ρ1{\rho }_{2}=4{\rho }_{1} . They are joined together at the point OO, as shown in the figure. The combination is used as a sonometer wire and kept under tension TT. The point OO is midway between the two bridges. When a stationary wave is set up in the composite wire, the joint is found to be a node. The ratio of the number of antinodes formed in W1{W}_{1} to W2{W}_{2} is

    JEE Main/MCQ/Medium/Stationary waves/With diagram
  61. 61Length of a string tied to two rigid supports is 40 cm40 \mathrm{~cm}. Maximum length (wave length in cm\mathrm{cm} ) of a stationary wave produced on it isJEE Main/MCQ/Medium/Stationary waves
  62. 62A sonometer wire of resonating length 90 cm90 \mathrm{~cm} has a fundamental frequency of 400 Hz400 \mathrm{~Hz} when kept under some tension. The resonating length of the wire with fundamental frequency of 600 Hz600 \mathrm{~Hz} under same tension _____cm\mathrm{cm}.JEE Main/Numerical/Medium/Vibration of String
  63. 63A tuning fork resonates with a sonometer wire of length 1m1m stretched with a tension of 6N.6N. When the tension in the wire is changed to 54N,54N, the same tuning fork produces 1212 beats per second with it. The frequency of the tuning fork is _______ Hz.Hz.JEE Main/Numerical/Medium/Vibration of String
  64. 64In an experiment with sonometer when a mass of 180g180g is attached to the string, it vibrates with fundamental frequency of 30Hz30Hz. When a mass mm is attached, the string vibrates with fundamental frequency of 50Hz50Hz. The value of mm is ______ gg.JEE Main/Numerical/Medium/Vibration of String
  65. 65A wire of density 8×103kgm−38\times {10}^{3}kg{m}^{-3} is stretched between two clamps 0.5m0.5m apart. The extension developed in the wire is 3.2×10−4m3.2\times {10}^{-4}m. If Y=8×1010Nm−2Y=8\times {10}^{10}N{m}^{-2}, the fundamental frequency of vibration in the wire will be _____ HzHzJEE Main/Numerical/Medium/Vibration of String
  66. 66A guitar string of length 90cm90cm vibrates with a fundamental frequency of 120Hz120Hz. The length of the string producing a fundamental of 180Hz180Hz will be _____ cmcmJEE Main/Numerical/Medium/Vibration of String
  67. 67A wire of length 30cm30cm, stretched between rigid supports, has it's nth{n}^{th} and (n+1)th{\left(n+1\right)}^{th} harmonics at 400Hz400Hz and 450Hz450Hz, respectively. If tension in the string is 2700N2700N, it's linear mass density is _____ kgm−1kg{m}^{-1}.JEE Main/Numerical/Medium/Vibration of String
  68. 68A wire having a linear mass density 9.0×10−4kgm−19.0\times {10}^{-4}kg{m}^{-1} is stretched between two rigid supports with a tension of 900N.900N. The wire resonates at a frequency of 500Hz.500Hz. The next higher frequency at which the same wire resonates is 550Hz.550Hz. The length of the wire is ___________ m.m.JEE Main/Numerical/Medium/Vibration of String
  69. 69Two identical strings XX and ZZ made of same material have tension TX{T}_{X} and TZ{T}_{Z} in then if their fundamental frequencies are 450Hz450Hz and 300Hz300Hz, respectively, then the ratio TX/TZ{T}_{X}/{T}_{Z} is :JEE Main/MCQ/Medium/Vibration of String
  70. 70A wire of length LL and mass per unit length 6.0×10−3kgm−16.0\times {10}^{-3}kg{m}^{-1} is put under tension of 540N.540N. Two consecutive frequencies that it resonates at are: 420Hz420Hz and 490Hz.490Hz. Then LL in meters is :JEE Main/MCQ/Medium/Vibration of String
  71. 71A string 2.0m2.0m long and fixed at its ends is driven by a 240Hz240Hz vibrator. The string vibrates in its third harmonic mode. The speed of the wave and its fundamental frequency isJEE Main/MCQ/Medium/Vibration of String
  72. 72A wire of length 2L,2L, is made by joining two wires AA and BB of same length but different radii rr and 2r2r and made of the same material. It is vibrating at a frequency such that the joint of the two wires forms a node. If the number of antinodes in wire AA is pp and that in BB is qq then ratio p:qp:q is:
    JEE Main/MCQ/Medium/Vibration of String/With diagram
  73. 73A uniform string of length 20m20m is suspended from a rigid support. A short wave pulse is introduced at its lowest end. It starts moving up the string. The time taken to reach the support is
    (Take,     g=10ms−2g=10m{s}^{-2})    JEE Main/MCQ/Medium/Vibration of String
  74. 74The total length of a sonometer wire fixed between two bridges is 110cm110cm. Now, two more bridges are placed to divide the length of the wire in the ratio 6:3:26:3:2. If the tension in the wire is 400N400N and the mass per unit length of the wire is 0.01kgm−10.01kg{m}^{-1}, then the minimum common frequency with which all the three parts can vibrate, isJEE Main/MCQ/Medium/Vibration of String
  75. 75A sonometer wire of length 114 cm114 \mathrm{~cm} is fixed at both the ends. Where should the two bridges be placed so as to divide the wire into three segments whose fundamental frequencies are in the ratio 1:3:41: 3: 4 ?JEE Main/MCQ/Medium/Vibration of String
  76. 76A sonometer wire of length 1.5m1.5m is made of steel. The tension in it produces an elastic strain of \text{1%}. What is the fundamental frequency of steel if density and elasticity of steel are 7.7×103kgm−37.7\times {10}^{3}kg{m}^{-3} and 2.2×1011Nm−22.2\times {10}^{11}N{m}^{-2} respectively?JEE Main/MCQ/Medium/Vibration of String
  77. 77The equation of a wave on a string of linear mass density 0.04 kg m−10.04 \mathrm{~kg} \mathrm{~m}^{-1} is given by y=0.02( m)sin⁡[2π(t0.04( s)−x0.50( m))]y=0.02(\mathrm{~m}) \sin \left[2 \pi\left(\frac{\mathrm{t}}{0.04(\mathrm{~s})}-\frac{\mathrm{x}}{0.50(\mathrm{~m})}\right)\right]. The tension in the string isJEE Main/MCQ/Medium/Vibration of String
  78. 78A string is stretched between fixed points separated by 75 cm75 \mathrm{~cm}. It is observed to have resonant frequencies of 420 Hz420 \mathrm{~Hz} and 315 Hz315 \mathrm{~Hz}. There are no other resonant frequencies between these two. Then, the lowest resonant frequency for this string isJEE Main/MCQ/Medium/Vibration of String
  79. 79A tuning fork of known frequency 256 Hz256 \mathrm{~Hz} makes 5 beats per second with the vibrating string of a piano. The beat frequency decreases to 2 beats per second when the tension in the piano string is slightly increased. The frequency of the piano string before increasing the tension wasJEE Main/MCQ/Medium/Vibration of String
  80. 80The fifth harmonic of a closed organ pipe is found to be in unison with the first harmonic of an open pipe. The ratio of lengths of closed pipe to that of the open pipe is 5/x5 / x. The value of xx is ____\_\_\_\_.JEE Main/MCQ/Medium/Organ Pipe (Vibration of Air Column)
  81. 81In an open organ pipe ν3\nu_{3} and ν6\nu_{6} are 3rd 3^{\text {rd }} and 6th 6^{\text {th }} harmonic frequencies, respectively. If ν6−ν3=2200 Hz\nu_{6}-\nu_{3}=2200 \mathrm{~Hz} then length of the pipe is ____\_\_\_\_ mm . (Take velocity of sound in air is 330 m/s330 \mathrm{~m} / \mathrm{s}.)JEE Main/MCQ/Medium/Organ Pipe (Vibration of Air Column)
  82. 82In an experiment with a closed organ pipe, it is filled with water by (15)\left(\frac{1}{5}\right) th of its volume. The frequency of the fundamental note will change byJEE Main/MCQ/Medium/Organ Pipe (Vibration of Air Column)
  83. 83In the resonance experiment, two air columns (closed at one end) of 100 cm and 120 cm long, give 15 beats per second when each one is sounding in the respective fundamental modes. The velocity of sound in the air column is :JEE Main/MCQ/Medium/Organ Pipe (Vibration of Air Column)
  84. 84A closed organ and an open organ tube are filled by two different gases having same bulk modulus but different densities ρ1\rho_1 and ρ2′\rho_{2^{\prime}}, respectively. The frequency of 9th 9^{\text {th }} harmonic of closed tube is identical with 4th 4^{\text {th }} harmonic of open tube. If the length of the closed tube is 10 cm and the density ratio of the gases is ρ1:ρ2=1:16\rho_1: \rho_2=1: 16, then the length of the open tube is :JEE Main/MCQ/Medium/Organ Pipe (Vibration of Air Column)
  85. 85A closed and an open organ pipe have same lengths. If the ratio of frequencies of their seventh overtones is (a−1a)\left(\frac{a-1}{a}\right) then the value of a\mathrm{a} is ________JEE Main/Numerical/Medium/Organ Pipe (Vibration of Air Column)
  86. 86Two open organ pipes of lengths 60 cm60 \mathrm{~cm} and 90 cm90 \mathrm{~cm} resonate at 6th 6^{\text {th }} and 5th 5^{\text {th }} harmonics respectively. The difference of frequencies for the given modes is _______ Hz\mathrm{Hz}. (Velocity of sound in air =333 m/s=333 \mathrm{~m} / \mathrm{s} )JEE Main/Numerical/Medium/Organ Pipe (Vibration of Air Column)
  87. 87The fundamental frequency of a closed organ pipe is equal to the first overtone frequency of an open organ pipe. If length of the open pipe is 60cm60cm, the length of the closed pipe will be :JEE Main/MCQ/Medium/Organ Pipe (Vibration of Air Column)
  88. 88In a closed organ pipe, the frequency of fundamental note is 30Hz30Hz. A certain amount of water is now poured in the organ pipe so that the fundamental frequency is increased to 110Hz110Hz. If the organ pipe has a cross-sectional area of 2cm22{cm}^{2}, the amount of water poured in the organ tube is ________gg. (Take speed of sound in air is 330ms−1330m{s}^{-1} )JEE Main/Numerical/Medium/Organ Pipe (Vibration of Air Column)
  89. 89A closed organ pipe 150cm150cm long gives 77 beats per second with an open organ pipe of length 350cm350cm, both vibrating in fundamental mode. The velocity of sound is ______ ms−1m{s}^{-1}.JEE Main/Numerical/Medium/Organ Pipe (Vibration of Air Column)
  90. 90For a certain organ pipe, the first three resonance frequencies are in the ratio of 1:3:51:3:5 respectively. If the frequency of fifth harmonic is 405Hz405Hz and the speed of sound in air is 324ms–1324m{s}^{–1} the length of the organ pipe is _____ mm.JEE Main/Numerical/Medium/Organ Pipe (Vibration of Air Column)
  91. 91An organ pipe 40cm40cm long is open at both ends. The speed of sound in air is 360ms−1360m{s}^{-1}. The frequency of the second harmonic is _________Hz.JEE Main/Numerical/Medium/Organ Pipe (Vibration of Air Column)
  92. 92In an experiment to determine the velocity of sound in air at room temperature using a resonance tube, the first resonance is observed when the air column has a length of 20.0cm20.0cm for a tuning fork of frequency 400Hz400Hz is used. The velocity of the sound at room temperature is 336ms−1336{ms}^{-1}. The third resonance is observed when the air column has a length of _____ cmcmJEE Main/Numerical/Medium/Organ Pipe (Vibration of Air Column)
  93. 93A tunning fork of frequency 340Hz340Hz resonates in the fundamental mode with an air column of length 125cm125cm in a cylindrical tube closed at one end. When water is slowly poured in it, the minimum height of water required for observing resonance once again is _____ cmcm.
    (Velocity of sound in air is     340ms−1340{ms}^{-1})    JEE Main/Numerical/Medium/Organ Pipe (Vibration of Air Column)
  94. 94The first overtone frequency of an open organ pipe is equal to the fundamental frequency of a closed organ pipe. If the length of the closed organ pipe is 20cm20cm. The length of the open organ pipe is _____ cmcmJEE Main/Numerical/Medium/Organ Pipe (Vibration of Air Column)
  95. 95A tuning fork is vibrating at 250Hz250Hz. The length of the shortest closed organ pipe that will resonate with the tuning fork will be _____cmcm. (Take speed of sound in air as 340ms−1340{ms}^{-1} )JEE Main/Numerical/Medium/Organ Pipe (Vibration of Air Column)
  96. 96A closed organ pipe of length LL and an open organ pipe contain gases of densities ρ1{\rho }_{1} and ρ2{\rho }_{2} respectively. The compressibility of gases are equal in both the pipes. Both the pipes are vibrating in their first overtone with same frequency. The length of the open pipe is x3Lρ1ρ2\dfrac{x}{3}L\sqrt{\dfrac{{\rho }_{1}}{{\rho }_{2}}}, where xx is _______.
    (Round off to the Nearest Integer)    JEE Main/Numerical/Medium/Organ Pipe (Vibration of Air Column)
  97. 97A student is performing the experiment of the resonance column. The diameter of the column tube is 6cm6cm. The frequency of the tuning fork is 504Hz504Hz. Speed of the sound at the given temperature is 336ms−1336m{s}^{-1}. The zero of the meter scale coincides with the top end of the resonance column tube. The reading of the water level in the column when the first resonance occurs is:JEE Main/MCQ/Medium/Organ Pipe (Vibration of Air Column)
  98. 98In a resonance tube experiment when the tube is filled with water up to a height of 17.0cm,17.0cm\text{,} from bottom, it resonates with a given tuning fork. When the water level is raised the next resonance with the same tuning fork occurs at a height of 24.5cm.24.5cm\text{.} If the velocity of sound in air is 330ms−1,330m{s}^{-1}\text{,} the tuning fork frequency is :JEE Main/MCQ/Medium/Organ Pipe (Vibration of Air Column)
  99. 99A one metre long (both ends open) organ pipe is kept in a gas that has double the density of air at STP. Assuming the speed of sound in air at STP is 300m/s,300m/s, the frequency difference between the fundamental and second harmonic of this pipe is __________ Hz.JEE Main/Numerical/Medium/Organ Pipe (Vibration of Air Column)
  100. 100A resonance tube is old and has a jagged end. It is still used in the laboratory to determine the velocity of sound in air. A tuning fork of frequency 512Hz512Hz produces first resonance when the tube is filled with water to a mark 11cm11cm below a reference mark, near the open end of the tube. The experiment is repeated with another fork of frequency 256Hz256Hz which produces first resonance when water reaches a mark 27cm27cm below the reference mark. The velocity of sound in air, obtained in the experiment, is close toJEE Main/MCQ/Medium/Organ Pipe (Vibration of Air Column)
  101. 101A closed organ pipe has a fundamental frequency of 1.5kHz1.5 kHz. The number of overtones that can be distinctly heard by a person with this organ pipe will be ((Assume that the highest frequency a person can hear is 20,000Hz20,000 Hz).JEE Main/MCQ/Medium/Organ Pipe (Vibration of Air Column)
  102. 102The end correction of a resonance column is 1cm1cm. If the shortest length resonating with the tuning fork is 10cm10cm, the next resonating length should beJEE Main/MCQ/Medium/Organ Pipe (Vibration of Air Column)
  103. 1035 beats/ second are heard when a turning fork is sounded with a sonometer wire under tension, when the length of the sonometer wire is either 0.95 m0.95 \mathrm{~m} or 1 m1 \mathrm{~m}. The frequency of the fork will be:JEE Main/MCQ/Medium/Organ Pipe (Vibration of Air Column)
  104. 104A tuning fork vibrates with frequency 256Hz256Hz and gives one beat per second with the third normal mode of vibration of an open pipe. What is the length of the pipe? (speed of sound in air is 340ms−1340m{s}^{-1})JEE Main/MCQ/Medium/Organ Pipe (Vibration of Air Column)
  105. 105A tuning fork vibrates with frequency 256 Hz256 \mathrm{~Hz} and gives one best per second with the third normal mode of vibration of an open pipe. What is the length of the pipe? (Speed of sound of air is 340 ms−1340 \mathrm{~ms}^{-1} )JEE Main/MCQ/Medium/Organ Pipe (Vibration of Air Column)
  106. 106A pipe open at both ends has a fundamental frequency ff in air. The pipe is dipped vertically in water so that half of it is in water. The fundamental frequency of the air column is now:JEE Main/MCQ/Medium/Organ Pipe (Vibration of Air Column)
  107. 107A pipe of length 85 cm is closed from one end. Find the number of possible natural oscillations of air column in the pipe whose frequencies lie below 1250 Hz. The velocity of sound in air is 340 m/s.JEE Main/MCQ/Medium/Organ Pipe (Vibration of Air Column)
  108. 108An air column in a pipe, which is closed at one end, will be in resonance wtih a vibrating tuning fork of frequency 264 Hz264 \mathrm{~Hz} if the length of the column in cm\mathrm{cm} is (velocity of sound =330 m/s=330 \mathrm{~m} / \mathrm{s} )JEE Main/MCQ/Medium/Organ Pipe (Vibration of Air Column)
  109. 109A uniform tube of length 60.5 cm60.5 \mathrm{~cm} is held vertically with its lower end dipped in water. A sound source of frequency 500 Hz500 \mathrm{~Hz} sends sound waves into the tube. When the length of tube above water is 16 cm16 \mathrm{~cm} and again when it is 50 cm50 \mathrm{~cm}, the tube resonates with the source of sound. Two lowest frequencies (in Hz\mathrm{Hz} ), to which tube will resonate when it is taken out of water, are (approximately).JEE Main/MCQ/Medium/Organ Pipe (Vibration of Air Column)
  110. 110This question has Statement 1and Statement 2. Of the four choices given after the Statements, choose the one that best describes the two Statements.
    Statement 1: In the resonance tube experiment, if the tuning fork is replaced by another identical turning fork but with its arm having been filled, the length of the air column should be increased to obtain resonance again.
    Statement 2: On filling the arms, the frequency of a tuning fork increases.    JEE Main/MCQ/Medium/Organ Pipe (Vibration of Air Column)
  111. 111A cylindrical tube, open at both ends, has a fundamental frequency, f\mathrm{f}, in air. The tube is dipped vertically in water so that half of it is in water. The fundamental frequency of the air-column is nowJEE Main/MCQ/Medium/Organ Pipe (Vibration of Air Column)
  112. 112While measuring the speed of sound by performing a resonance column experiment, a student gets the first resonance condition at a column length of 18 cm18 \mathrm{~cm} during winter. Repeating the same experiment during summer, she measures the column length to be xcm\mathrm{xcm} for the second resonance. ThenJEE Main/MCQ/Medium/Organ Pipe (Vibration of Air Column)
  113. 113Tube A has both ends open while tube B has one end closed, otherwise they are identical. The ratio of fundamental frequency of tube AA and BB isJEE Main/MCQ/Medium/Organ Pipe (Vibration of Air Column)
  114. 114Two tuning forks AA and BB are sounded together giving rise to 8 beats in 2 s. When fork AA is loaded with wax, the beat frequency is reduced to 4 beats in 2 s. If the original frequency of tuning fork BB is 380 Hz then original frequency of tuning fork AA is ____\_\_\_\_ Hz.JEE Main/Numerical/Medium/Beats
  115. 115Two harmonic waves moving in the same direction superimpose to form a wave x=acos⁡(1.5t)cos⁡(50.5t)\mathrm{x}=\mathrm{a} \cos (1.5 \mathrm{t}) \cos (50.5 \mathrm{t}) where tt is in seconds. Find the period with which they beat (close to nearest integer)JEE Main/MCQ/Medium/Beats
  116. 116An observer is riding on a bicycle and moving towards a hill at 18kmh−118km{h}^{-1}. He hears a sound from a source at some distance behind him directly as well as after its reflection from the hill. If the original frequency of the sound as emitted by source is 640Hz640Hz and velocity of the sound in air is 320ms−1320m{s}^{-1}, the beat frequency between the two sounds heard by observer will be _____ HzHz.JEE Main/Numerical/Medium/Beats
  117. 117The velocity of sound in a gas, in which two wavelengths 4.08m4.08m and 4.16m4.16m produce 4040 beats in 12s12s, will beJEE Main/MCQ/Medium/Beats
  118. 118A radar sends an electromagnetic signal of electric field (E0)=2.25Vm−1\left({E}_{0}\right)=2.25V{m}^{-1} and magnetic field (B0)=1.5×10−8T\left({B}_{0}\right)=1.5\times {10}^{-8}T which strikes a target on line of sight at a distance of 3km3km in a medium. After that, a part of signal (echo) reflects back towards the radar with same velocity and by same path. If the signal was transmitted at time t=0t=0 from radar, then after how much time echo will reach to the radar?JEE Main/MCQ/Medium/Beats
  119. 119A set of 2020 tuning forks is arranged in a series of increasing frequencies. If each fork gives 44 beats with respect to the preceding fork and the frequency of the last fork is twice the frequency of the first, then the frequency of last fork is _____ HzHz.JEE Main/Numerical/Medium/Beats
  120. 120A tuning fork AA of unknown frequency produces 5beatss−15beats{s}^{-1} with a fork of known frequency 340Hz340Hz. When fork AA is filed, the beat frequency decreases to 2beatss−12beats{s}^{-1}. What is the frequency of fork AA ?JEE Main/MCQ/Medium/Beats
  121. 121The correct figure that shows, schematically, the wave pattern produced by the superposition of two waves of frequencies 9Hz9Hz and11Hz11Hz, isJEE Main/MCQ/Medium/Beats
  122. 122Two sitar strings, AA and BB playing the note 'DhaDha' are slightly out of tune and produce beats of frequency 5Hz5Hz. The tension of the string BB is slightly increased and the beat frequency is found to decrease by 3Hz3Hz. If the frequency of AA is 425Hz425Hz. The original frequency of BB isJEE Main/MCQ/Medium/Beats
  123. 123Three sound waves of equal amplitudes have frequencies (v−1),v,(v+1)(v-1), v,(v+1). They superpose to give beats. The number of beats produced per second will beJEE Main/MCQ/Medium/Beats
  124. 124When two tuning forks (fork 1 and fork 2) are sounded simultaneously, 4 beats per second are heard. Now, some tape is attached on the prong of the fork 2 . When the tuning forks are sounded again, 6 beats per seconds are heard. If the frequency of fork 1 is 200 Hz200 \mathrm{~Hz}, then what was the original frequency of fork 2 ?JEE Main/MCQ/Medium/Beats
  125. 125A tuning fork arrangement (pair) produces 4 beats / sec with one fork of frequency 288cps288 \mathrm{cps}. A little wax is placed on the unknown fork and it then produces 2 beats /sec. The frequency of the unknown fork isJEE Main/MCQ/Medium/Beats
  126. 126The speed of a longitudinal wave in a metallic bar is 400 m/s400 \mathrm{~m} / \mathrm{s}. If the density and Young's modulus of the bar material are increased by 0.5%0.5 \% and 1%1 \%, respectively then the speed of the wave is changed approximately to ____\_\_\_\_ m/s\mathrm{m} / \mathrm{s}.JEE Main/MCQ/Medium/Speed of Sound Waves
  127. 127The velocity of sound in air is doubled when the temperature is raised from 0∘C0^{\circ} \mathrm{C} to α∘C\alpha^{\circ} \mathrm{C}. The value of α\alpha is ____\_\_\_\_.JEE Main/Numerical/Medium/Speed of Sound Waves
  128. 128Two strings with circular cross section and made of same material, are stretched to have same amount of tension. A transverse wave is then made to pass through both the strings. The velocity of the wave in the first string having the radius of cross section R is v1\mathrm{v}_1, and that in the other string having radius of cross section R/2R / 2 is v2v_2. Then v2v1=\frac{v_2}{v_1}=JEE Main/MCQ/Medium/Speed of Sound Waves
  129. 129Consider the sound wave travelling in ideal gases of He,CH4\mathrm{He}, \mathrm{CH}_4, and CO2\mathrm{CO}_2. All the gases have the same ratio Pρ\frac{P}{\rho}, where PP is the pressure and ρ\rho is the density. The ratio of the speed of sound through the gases vHe:vCH4:vCO2\mathrm{v}_{\mathrm{He}}: \mathrm{v}_{\mathrm{CH}_4}: \mathrm{v}_{\mathrm{CO}_2} is given byJEE Main/MCQ/Medium/Speed of Sound Waves
  130. 130Given below are two statements: one is labelled as Assertion A and the other is labelled as
    Reason     R\mathbf{R}
    Assertion A: A sound wave has higher speed in solids than gases.
    Reason R: Gases have higher value of Bulk modulus than solids.
    In the light of the above statements, choose the correct answer from the options given below    JEE Main/MCQ/Medium/Speed of Sound Waves
  131. 131The speed of sound in oxygen at S.T.P. will be approximately:
    (Given,     R=8.3JK−1,γ=1.4)R=8.3J{K}^{-1},\gamma =1.4)    JEE Main/MCQ/Medium/Speed of Sound Waves
  132. 132The fundamental frequency of vibration of a string between two rigid support is 50Hz50Hz. The mass of the string is 18g18g and its linear mass density is 20gm−120g{m}^{-1}. The speed of the transverse waves so produced in the string is _______ ms–1m{s}^{–1}.JEE Main/Numerical/Medium/Speed of Sound Waves
  133. 133The ratio of speed of sound in hydrogen gas to the speed of sound in oxygen gas at the same temperature is:JEE Main/MCQ/Medium/Speed of Sound Waves
  134. 134For a solid rod, the Young's modulus of elasticity is 3.2×1011Nm−23.2\times {10}^{11}N{m}^{-2} and density is 8×103kgm−38\times {10}^{3}kg{m}^{-3}. The velocity of longitudinal wave in the rod will beJEE Main/MCQ/Medium/Speed of Sound Waves
  135. 135The speed of a transverse wave passing through a string of length 50cm50cm and mass 10g10g is 60ms−160m{s}^{-1}. The area of cross-section of the wire is 2.0mm22.0{mm}^{2} and its Young's modulus is 1.2×1011Nm−21.2\times {10}^{11}N{m}^{-2}. The extension of the wire over its natural length due to its tension will be x×10−5mx\times {10}^{-5}m. The value of xx is _____ .JEE Main/Numerical/Medium/Speed of Sound Waves
  136. 136Sound travels in a mixture of two moles of helium and nn moles of hydrogen. If rms speed of gas molecules in the mixture is 2\sqrt{2} times the speed of sound, then the value of nn will beJEE Main/MCQ/Medium/Speed of Sound Waves
  137. 137The amplitude of wave disturbance propagating in the positive xx-direction is given by y=1(1+x)2y=\dfrac{1}{(1+x{)}^{2}} at time t=0t=0 and y=11+(x−2)2y=\dfrac{1}{1+(x-2{)}^{2}} at t=1st=1s, where xx and yy are in metres. The shape of wave does not change during the propagation. The velocity of the wave will be ms−1.m{s}^{-1}.JEE Main/Numerical/Medium/Speed of Sound Waves
  138. 138The pressure wave, P=0.01sin⁡⁡[1000t−3x]Nm–2P=0.01\sin ⁡\left[1000t-3x\right]N{m}^{–2} , corresponds to the sound produced by a vibrating blade on a day when atmospheric temperature is 0∘C0^{\circ}C . On some other day when temperature is TT , the speed of sound produced by the same blade and at the same frequency is found to be 336ms–1336m{s}^{–1} . Approximate value of TT is:JEE Main/MCQ/Medium/Speed of Sound Waves
  139. 139When two sound waves travel in the same direction in a medium, the displacements of a particle located at ' xx ' at time ' tt ' is given by :
    $\begin{aligned}
    & y_1=0.05 \cos (0.50 \pi x-100 \pi t) \\
    & y_2=0.05 \cos (0.46 \pi x-92 \pi t)
    \end{aligned}$
    where     y1,y2y_1, y_2 and xx are in meters and tt in seconds.
    The speed of sound in the medium is :    JEE Main/MCQ/Medium/Speed of Sound Waves
  140. 140The speed of sound in oxygen (O2)\left(\mathrm{O}_2\right) at a certain temperature is 460 ms−1460 \mathrm{~ms}^{-1}. The speed of sound in helium (He) at the same temperature will be (assumed both gases to be ideal)JEE Main/MCQ/Medium/Speed of Sound Waves
  141. 141A small speaker delivers 2W2W of audio output. At what distance from the speaker will one detect 120dB120dB intensity sound? [Given reference intensity of sound as 10−12W/m2{10}^{-12}W/{m}^{2} ]JEE Main/MCQ/Medium/Properties of Sound Waves
  142. 142A sound absorber attenuates the sound level by 20 dB20 \mathrm{~dB}. The intensity decreases by a factor ofJEE Main/MCQ/Medium/Properties of Sound Waves

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