Question

A car is moving towards a high cliff. The driver sounds a horn of frequency f. The reflected sound heard by the driver has frequency 2f. If v the velocity of sound, then the velocity of the car in the same velocity units, will be
1). v/√2
2). v/3
3). v/4
4). v/2

Answer 1

Explanation:

Correct option (2)v/3

Explanation:

1 st the car is the source and at the cliff, one observes f'.

2nd cliff is now source. It emits frequency.f' and the observer is now the driver who observes f'.

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Answer 2

Answer:

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We have, v=v+vsv/v−vs

or 2f=v+vs/v−vsf

or 2(v−vs)=v+vs

or 2v−2vs=v+vs

∴v=s/3v

or v/3