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MENTAL MODEL · M3720

Doppler Effect

Doppler Effect
TechnicalHigh supportPhysics
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Version 1.0.0 · Updated 2026-07-28

CORE DEFINITION

The Doppler effect (also Doppler shift) is the change in the frequency or, equivalently, the period of a wave in relation to an observer who is moving relative to the source of the wave. It is named after the physicist Christian Doppler, who described the phenomenon in 1842. A common example of Doppler shift is the change of pitch heard when a vehicle approaches and recedes from an observer. Compa

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The Doppler effect (also Doppler shift) is the change in the frequency or, equivalently, the period of a wave in relation to an observer who is moving relative to the source of the wave. It is named a

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The Doppler effect refers to the shift in observed frequency due to relative motion between the wave source and the observer: approaching causes a blue shift, receding causes a red shift. The mechanism is that wavefronts are compressed or stretched.

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    en.wikipedia.orghttps://en.wikipedia.org/wiki/Doppler_effectZH · Explicit
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