The wave equation is $y = 0.30\sin (314t - 1.57x)$ where $t, x$ and $y$ are in second, meter and centimeter respectively. The speed of the wave is ..... $m/s$
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(b) $\omega = 314$, $k = 1.57$ and $v = \frac{\omega }{k} = \frac{{314}}{{1.57}} = 200\,m/s.$
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