The Doppler effect causes the frequency of a source to be shifted with
respect to an observer, as described on the Doppler
page. When the source is stationary, the waves move out uniformly in all directions:
When the source is moving to the right, each new wave is centered at points farther to the right. An observer on the right will receive the waves at more frequent intervals (blue shift), while an observer on the left will receive the waves at less frequent intervals (red shift):
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