An observer is moving away from source of sound of frequency $100 Hz$. His speed is $33 \,m/s$. If speed of sound is $330 \,m/s$, then the observed frequency is .... $Hz$
Medium
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(a) $n' = n\,\left( {\frac{{v - {v_O}}}{v}} \right) = \left( {\frac{{330 - 33}}{{330}}} \right) \times 100 = 90\,Hz$
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