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29/11/1803 Famous physicist is born

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Christian Doppler - Video Learning - WizScience.com

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The Doppler effect explains why a police siren changes pitch as it passes

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Doppler Effect

Austrian physicist and mathematician Christian Doppler is most known for his discovery of what is today called the Doppler effect. It is the change of wave frequency for an observer who is moving relative to the wave source. Doppler used his effect for an explanation of color of binary stars.