A source of sound $S$ is moving with a velocity $50m/s$ towards a stationary observer. The observer measures the frequency of the source as $1000 Hz$. What will be the apparent frequency of the source when it is moving away from the observer after crossing him .... $Hz$ $?$ The velocity of sound in the medium is $350 m/s$
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(a) By using $\frac{{{n_{{\rm{approaching}}}}}}{{{n_{{\rm{receding}}}}}} = \frac{{v + {v_s}}}{{v - {v_s}}}$
==> $\frac{{1000}}{{{n_r}}} = \frac{{350 + 50}}{{350 - 50}}$ ==> ${n_r} = 750Hz.$
==> $\frac{{1000}}{{{n_r}}} = \frac{{350 + 50}}{{350 - 50}}$ ==> ${n_r} = 750Hz.$
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