A source is moving towards an observer with a speed of $20 m/s$ and having frequency of $240 Hz.$ The observer is now moving towards the source with a speed of $20 m/s$. Apparent frequency heard by observer, if velocity of sound is $340 m/s$, is ... $Hz$
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(b) $n' = n\,\left( {\frac{{v + {v_O}}}{{v - {v_S}}}} \right) = 240\,\left( {\frac{{340 + 20}}{{340 - 20}}} \right) = 270\,Hz$.
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