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Doppler effect
01
Dopplereffekt, Doppler-effekt
the change in frequency or wavelength of a wave in relation to an observer who is moving relative to the source of the wave, producing a shift in pitch or color
Example
The Doppler effect explains why the pitch of an ambulance siren changes as it approaches and then passes by.
When a car with a honking horn drives by, the change in pitch you hear is due to the Doppler effect.
In astronomy, the Doppler effect helps scientists determine the speed and direction of celestial objects.
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