Question: A baseball hits a car, breaking its window and triggering its alarm which sounds at a frequency of 1 2 1 0 Hz . What

A baseball hits a car, breaking its window and triggering its alarm which sounds at a frequency of 1210 Hz. What frequency (in Hz) is heard by a boy on a bicycle riding away from the car at 7.05 m/s? Take the speed of sound to be 343 m/s.
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