1.

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

Answer»

ANSWER:

according to DOPPLER effect F(V-Vo)/(V-Vs)=f'

f'=240×(340+20)/(340-20)=240×360/320=270Hz.

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