Not Doppler

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via Wikipedia
The Doppler effect, named after Austrian physicist Christian Doppler who proposed it in 1842 in Prague, is the change in frequency of a wave for an observer moving relative to the source of the wave. It is commonly heard when a vehicle sounding a siren or horn approaches, passes, and recedes from an observer. The received frequency is higher during the approach, it is identical at the instant of passing by, and it is lower during the recession.
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