The speed of a wave in a certain medium is $960\, m/s$. If $3600$ waves pass over a certain point of the medium in $1\, minute$, the wavelength is .... $metres$
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(d) $\,n = \frac{{3600}}{{60}} = 60 Hz$
==> $\lambda = \frac{v}{n} = \frac{{960}}{{60}} = 16\,m$
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