Question

A police car moving at 22 m/s, chases motorcyclist. The police man sounds his horn at 176 Hz , while both of them move towards a stationary siren of frequency 165 Hz . Then the speed of the motorcycle, if he does not observe any beat is (speed of sound is 330 m/s):

(a)  33 m/s

(b)  22 m/s

(c)  zero

(d)  11 m/s. 

Answer 1

Correct option (b) 22 m/s 

Explanation:

 Apparent frequency of police car

Apparent frequency of stationary siren

Since no beat is heard by motorcyclist,