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A police car moving at 22(m)/(s) chases ...


A police car moving at `22(m)/(s)` chases a motorcyclist. The police man sounds his horn of frequency 176 Hz, while both of them move towards a stationary siren of frequency 165 Hz. Calculate the speed of motorcyclist if it is given that he does not hear any beat (speed of sound in air is `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
`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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