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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?
11 years ago

Answers

Elena
http://ca.answers.yahoo.com/question/index?qid=20110225140613AAXANMW
11 years ago

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