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Doppler Effect

Doppler Effect

The Doppler effect is the perceived change in frequency of sound emitted by a source moving relative to the observer: as a plane flies overhead, the note of the engine becomes noticeably lower, as does the siren noise from a fast-moving emergency vehicle as it passes.  The effect was first noted by Christian Doppler in 1842.  The effect is widely used to measure velocities, usually by reflection of a transmitted wave from the moving...

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