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A car travelling at a speed of 54 km/hr ...

A car travelling at a speed of 54 km/hr towards a large wall horns a sound of frequency 400 Hz if the person stands behind the car such that the car receding from him approaches the wall the difference in frequencies of the two sounds one recieved directly from the car and the other reflected from the wall (speed of sound is 335 m/s)

A

`35.9Hz`

B

20Hz

C

70 Hz

D

30 Hz

Text Solution

Verified by Experts

The correct Answer is:
A
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