Asked by David

A police car, whose siren has a natural frequency of 620Hz, moves away from a wall and towards a stationary observer at a speed of 30km/h.

What is the beat frequency perceived by the observer?

If the observer stands between the car and the wall, what beat frequency does he perceive?

Answers

Answered by Elena
http://ca.answers.yahoo.com/question/index?qid=20110225140613AAXANMW
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