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A plane progressive wave is given by $y=2 \cos 2 \pi(330 \mathrm{t}-x) \mathrm{m}$. The frequency of the wave is :
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$330 \mathrm{~Hz}$
$\begin{aligned} & y=2 \cos 2 \pi(330 t-x) m \\ & y=A \cos (\omega t-k x) \\ & \text { by comparing } \omega=2 \pi \times 330 \\ & 2 \pi f=2 \pi \times 330 \\ & f=330\end{aligned}$
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