Question

A baseball hits a car, breaking its window and triggering its alarm which sounds at a frequency of 1250 Hz. What frequency (in Hz) is heard by a boy on a bicycle riding away from the car at 6.50 m/s? Take the speed of sound to be 343 m/s.

Answer 1

source at rest, observer moving away.

f= (343-6.50)/343 * 1250

Answer 2

1226.3