Q:

What name is given to the change in the observed frequency of a wave (or its reflection) because of the motion of the source (or the reflecting object) or of the observer?

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What name is given to the change in the observed frequency of a wave (or its reflection) because of the motion of the source (or the reflecting object) or of the observer?


  1. the beat frequency
  2. the red shift
  3. phase inversion
  4. the Doppler effect

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D: The change in frequency when the source of the (say) sound is in motion relative to the observer is called the Doppler effect. (The red shift in astronomy is due to the Doppler effect). 

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