An observer standing near the sea shore observes $54$ waves per minute. If the wavelength of the water wave is $10m$ then the velocity of water wave is .... $ms^{-1}$
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(d) Number of waves per minute $= 54$
Number of waves per second $= 54/60$
Now $v = n\lambda $
Number of waves per second $= 54/60$
Now $v = n\lambda $
$\Rightarrow$ $n = \frac{{54}}{{60}} \times 10 = 9\,m/s.$
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