The equation of a progressive wave is $y = a\,\sin \,\left( {\frac{\pi }{2}x - 200\pi t} \right)$ . The frequency of the wave will be .... $Hz$
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$\omega = 200\pi $
$2\pi \nu = 200\pi \,\,\,\,\,\,\,\,\,\,\, \Rightarrow \,\,\,\,\,\,\nu = 100\,Hz$
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