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August 30, 2014

Homework Help: physics

Posted by maria on Tuesday, November 15, 2011 at 6:31pm.

A policeman with a very good ear and a good understanding of the Doppler effect stands on the shoulder of a freeway assisting a crew in a 40-mph work zone. He notices a car approaching that is honking its horn. As the car gets closer, the policeman hears the sound of the horn as a distinct G3 tone (196 Hz). The instant the car passes by, he hears the sound as a distinct D3 tone (147 Hz). He immediately jumps on his motorcycle, stops the car, and gives the motorist a speeding ticket. How fast was this car going? (Assume that the speed of sound is 340 m/s.)

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