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Q.

A racing car moving towards a cliff, sounds its horn. The driver observes that the sound reflected from the cliff has a pitch one octave higher than the actual sound of the horn. If v is the velocity of sound, then the velocity of the car is

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a

v/2

b

v/2

c

v/3

d

v/4

answer is C.

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Detailed Solution

Frequency of reflected sound heard by driver n'=n v+v0v−vSIt is given that n'=2nHence, 2n=nv+vcarv−vcar⇒vcar=v/3.
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