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

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a

v4

b

v2

c

v2

d

v3

answer is D.

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Detailed Solution

when driver is approachig the wall the observer and virtual source approach each other with same velocity apparent frequency f1= v+v0v-v0f =2f solving for v0 we get v0= v3
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