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A police car moving at 22m//s, chases m...

A police car moving at `22m//s`, chases motorcyclist. The police man sounds his horn at `176 Hz`, while both of them move towards a ststionary siren of frequency `165 Hz`. Calculate the speed of the motorcycle, if it is given that he does not observes any beats.

A

33 m/s

B

22 m/s

C

zero

D

11 m/s

Text Solution

Verified by Experts

The correct Answer is:
B
`f_(1)` = frequency of the police car heard by motorcyclist,
`f_(2)` = frequency of the siren heard by motorcyclist.
`f_(1)=(330-v)/(330-22)xx176,f_(2)=(330 + v)/(330) xx165`
`:. f_(1)-f_(2)=0 rArr v=22 m//s`.
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