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Doppler Effect (view source)

Revision as of 04:11, January 1, 2007

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The Doppler Effect states that the frequency of sound and light emanating from a point will change depending on the motion of the source relative to an observer. For example, a bystander hears the pitch of an approaching train change as it passes and moves away from him.

This was discovered in 1842 by the Austrian Christian Johann Doppler.
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