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Waves

JEE Main level, numerical answer, medium

114 of 142

Question 114 of 142

Two tuning forks $A$ and $B$ are sounded together giving rise to 8 beats in 2 s. When fork $A$ is loaded with wax, the beat frequency is reduced to 4 beats in 2 s. If the original frequency of tuning fork $B$ is 380 Hz then original frequency of tuning fork $A$ is $\_\_\_\_$ Hz.

Show answer and solution

Answer: 384

|f_A - f_B| = 4

|f_A - 380| = 4

So,

f_A = 384

Hz or

376

Hz
on loading with wax

f_A

decreases
So,

f_A = 384

JEE Main question paper PDF

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JEE Main 2025 Apr 2 Shift 1 question paper

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JEE Main Physics practice question on Waves (Beats), with the answer and a step-by-step solution. Scan a question from your own book or paper to get a whiteboard video.

Two tuning forks AAA and BBB are sounded together giving rise to 8 beats in 2 s. When fork AAA is loaded with wax, the beat frequency is reduced to 4 beats in 2 s. If the original frequency of tuning fork BBB is 380 Hz then original frequency of tuning fork AAA is ____\_\_\_\_____ Hz.

JEE Main question paper PDF

More Physics practice

Two tuning forks $A$ and $B$ are sounded together giving rise to 8 beats in 2 s. When fork $A$ is loaded with wax, the beat frequency is reduced to 4 beats in 2 s. If the original frequency of tuning fork $B$ is 380 Hz then original frequency of tuning fork $A$ is $\_\_\_\_$ Hz.