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An airplane traveling at half the speed of sound emits a sound of frequency 4.14 kHz. (a) At what frequency does a stationary listener hear

An airplane traveling at half the speed of sound emits a sound of frequency 4.14 kHz. (a) At what frequency does a stationary listener hear the sound as the plane approaches? kHz (b) At what frequency does a stationary listener hear the sound after the plane passes? kHz


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