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

Options

A. 33m/s
B. 22m/s
C. zero
D. 11m/s

Answer

B

Explanation

`f_1` = requency of the police can 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 therefore f_1-f_2=0implies v= 22 m//s`