What is the Doppler effect?
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Each successive sound wave is a little shorter as the car comes towards you. Then as the car moves away, the process is reversed; the frequency decreases while the wavelength of the sound becomes longer.
You will not notice the Doppler effect if a supersonic aircraft flies past, because you cannot hear the sound of the plane until it is actually flying away from you.
Tags: sound wave
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Date Added: 13 December '11
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