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Krishna and Seldon now try a homework problem. A policeman sitting in his unmarked police car...

Krishna and Seldon now try a homework problem.

A policeman sitting in his unmarked police car sees an approaching motorcyclist go through a red light two blocks away. He turns on his siren at a frequency of 1000 Hz as the motorcyclist heads directly toward him at 51 mph (22.80 m/s).

What frequency does the motorcyclist hear? (Enter your answer to at least the nearest integer. Assume the speed of sound in air is 331 m/s.)

What frequency does the motorcyclist hear when stopped with the police car approaching at 51 mph (22.80 m/s)? (Enter your answer to at least the nearest integer. Assume the speed of sound in air is 331 m/s.)

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Answer #1

The Doppler effect

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