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

Answer

B

Explanation

`n_1=`frequency of the police car horn observer heard by motorcyclist
`n_2=` Frequency of the siren heard by motorcyclist
`v_2=` Speed of motorcyclist
`n_1=(330-v)/(330-22)xx176`,`n_2=(330+v)/(330)xx165`
`:. n_1-n_2=0impliesv=22m//s`.