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, the velocity of the car is
Asked by imtiyazmulla68
4th May 2018,
7:56 PM
Answered by Expert
Answer:
when observer is moving with speed Vo m/s, the original frequency of sound is νo and reflected frequency of sound heard is ν, then we have
ν = νo [1+ (Vo/V) ]................(1)
where V is sound velocity. It is given that reflected sound is one octave higher, hence ν = 2νo
then eqn(1) becomes, [1+ (Vo/V) ] = 2; solving for Vo, we get Vo = 2V
Answered by Expert
5th May 2018,
8:54 AM
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