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You're probably think of the Doppler effect, which is the change of the frequency of a signal depending on the motion of the observer relative to the signal source. The typical example involves a car horn and a person standing on the side of the road. If you are standing still next to a stopped car and its horn sounds, you will hear a certain pitch. If the same horn is sounded as the car is driving toward you, the pitch you perceive will be higher - the higher the car speed, the higher the pitch. If the car is driving away from you, the pitch will be lower. This is because the motion of the car is causing the sound waves to compress (driving toward you) or stretch (driving away from you), increasing or decreasing the frequency and raising or lowering the pitch.

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13y ago

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