A source is moving towords 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
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according to doppler effect f(V-Vo)/(V-Vs)=f'
f'=240×(340+20)/(340-20)=240×360/320=270Hz.
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