Two waves $y = 0.25\sin 316\,t$ and $y = 0.25\sin 310\,t$ are travelling in same direction. The number of beats produced per second will be
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(c) ${n_1} = \frac{{316}}{{2\pi }}$ and ${f_2} = \frac{{310}}{{2\pi }}$ Number of beats heard per second
=$ n_1 -n_2 =\frac{{316}}{{2\pi }} - \frac{{310}}{{2\pi }} = \frac{3}{\pi }$
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