Question

A siren moving away from a listener at 45m/s at a frenquency of 200Hz. The listener was moving towards it at a speed of 15m/s. Find the apprarent frequency

Answer 1

Answer:

we know that

apparent frequency f'=(v+15)×f/(v+45)

where v is speed of sound in air and f is original frequency

put the values and get the answer