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December 21, 2014

Homework Help: physics

Posted by David on Wednesday, October 9, 2013 at 12:50am.

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?

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