The pitch of the siren of a fire engine increses as it approaches a boy standing at a bus stop.the phenamenon behind it is due to_____.

The pitch of the siren of a fire engine increses as it approaches a bo

1.	The pitch of the siren of a fire engine increses as it approaches a boy standing at a bus stop.the phenamenon behind it is due to_____.
Answer» SOLUTION :DOPPLER EFFECT