The frequency of a whistle of an engine is $600\, cycles/sec$ is moving with the speed of $30 \,m/sec$ towards an observer. The apparent frequency will be .... $cps$ (velocity of sound $= 330 \,m/s$)
Medium
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(b) $n' = n\,\left( {\frac{v}{{v - {v_S}}}} \right) = 600\,\left( {\frac{{330}}{{300}}} \right) = 660$ $cps$
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