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A car sounding its horn at 480 Hz moves ...

A car sounding its horn at 480 Hz moves towards a high wall at a speed of 20 m/s, the frequency of the reflected sound heard by the man sitting in the car will be nearest to :

A

510 Hz

B

570 Hz

C

480 Hz

D

540 Hz

Text Solution

Verified by Experts

The correct Answer is:
D
After reflection from the wall, the sound moves towards observer in the car.
`v'=(v+v_(0))/(v-v_(s))xx v=(340+20)/(340-20) xx480`
`=540 Hz`
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