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A police car moving at 22 m//s, chase a ...

A police car moving at `22 m//s`, chase a motoclist. The police man has horn at `176 H_(Z)`, While both of them move towards a stationary siran of frequency `165 H_(Z)`. Calulate the speed of the motorcyclist, if he does not observer any beats. (velocity of sound in air `= 330 m//s)`

A

33 m/s

B

22 m/s

C

zero

D

11 m/s

Text Solution

Verified by Experts

The correct Answer is:
B
The motorcyclist observes no beats. So the apparent frequency observed by him from the sources must be equal.
`f_(1)`=Frequency recorded by motorcyclist from police car.
`f_(2)`=Frequency recored by motorcyclist from stationary siren.
`:. 176((330-upsilon)/(330-22))=165((330+upsilon)/330)`
Solving this equation we get, `upsilon=22 m//s`
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RESONANCE ENGLISH-SOUND WAVES-Exercise- 3 PART - I
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