The equation of a progressive wave is given by $y = a\sin (628t - 31.4x)$
If the distances are expressed in cms and time in seconds, then the wave velocity will be ...... $cm/sec$
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(c) $v = \frac{{{\rm{\,Co - efficient \,\,of \,\,}}t}}{{{\rm{\,Co - efficient\,\, of \,\,}}x}}$$ = \frac{{628}}{{31.4}} = 20\,cm/sec$
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