Doppler Effect Calculator
The Doppler effect is the change in frequency (pitch) of a wave when the source or observer is moving relative to the medium. A sound source moving toward you has a higher apparent frequency; moving away has lower frequency. Used in radar, medical ultrasound, and astronomy.
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Fun Fact
Christian Doppler first described this effect in 1842 for light waves in binary stars. A Viennese railway company tested it two years later by having musicians play on a moving train.
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