Sound from a moving source sounds different than from a stationary source.If the source is moving toward you, the sound will be higher in pitch.
If the source is moving away from you, the sound will be lower in pitch.
This is known as the Doppler effect.
If the source is moving toward you, the sound will be higher in pitch.
If the source is moving away from you, the sound will be lower in pitch.
A police "radar gun" uses the Doppler Effect to measure the speed of a moving vehicle by detecting the frequency of the waves reflected by the vehicle.
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(C) 2003, Doug Davis; all rights reserved
