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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. lf v is the velocity of sound, then the velocity of 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

The frequency of echo is given byn′=v+vsv−vsn 2n=v+vsv−vsn or 2v−2vs=v+vs or 3vs=v vs=v/3

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