Posted by **dan pogi** on Tuesday, June 28, 2011 at 9:43am.

A sound source producing 1.00-{\rm kHz} waves moves toward a stationary listener atone-half the speed of sound.

The frequency that the listener will hear is2000 Hz.

when the source is stationary and the listener moves towardthe source at one-half the speed of sound, the frequency that thelistener hear became 1500 Hz.

Explain on physical grounds why thetwo frequencies differ.

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