Question

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`

Answer 1

Correct Answer - B
:. `f_(2) = f_(2)`
:. `176 ((330 - nu)/(330 - 22)) = 165 ((330 + nu)/(330))`
Solving this equation we get,
`nu = 22 m//s`