Progressive wave of sound is represented by $y = a\sin [400\pi \,t - \pi x/6.85]$ where $x$ is in $m$ and $t$ is in sec. Frequency of the wave will be .... $Hz$
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(a) $n = \frac{\omega }{{2\pi }} = \frac{{400\pi }}{{2\pi }} = 200\,\,Hz$ (As $\omega = 400 \pi $)
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