Waves

JEE Main level, single correct, medium

29 of 142

Question 29 of 142

A 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 :

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Answer: (A) 330 Hz330 \mathrm{~Hz}

y=2cos⁡2π(330t−x)my=Acos⁡(ωt−kx) by comparing ω=2π×3302πf=2π×330f=330\begin{aligned} & y=2 \cos 2 \pi(330 t-x) m \\ & y=A \cos (\omega t-k x) \\ & \text { by comparing } \omega=2 \pi \times 330 \\ & 2 \pi f=2 \pi \times 330 \\ & f=330\end{aligned}

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