A small source of sound moves on a circle as shown in the figure and an observer is standing on $O$. Let ${n_1},\;{n_2}$ and ${n_3}$be the frequencies heard when the source is at $A,\,B$ and $C$ respectively. Then
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(b) At point $A$, source is moving away from observer so apparent frequency ${n_1} < n$ (actual frequency)
At point $B$ source is coming towards observer so apparent frequency ${n_2} > n$
and point $C$ source is moving perpendicular to observer so ${n_3} = n$
Hence ${n_2} > {n_3} > {n_1}$
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