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| Dop·pler ef·fect [ dópplər i fèkt ] or Dop·pler shift [ dópplər shìft ] |
noun |
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| Definition: |
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change in frequency because of motion: a perceived change in the frequency of a wave as the distance between the source and the observer changes. For example, the sound of a siren on a moving vehicle appears to change as it approaches and passes an observer.
See also blueshift
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| [Early 20th century. After Christian J. Doppler (1803-1853), Austrian physicist] |
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