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Doppler effect
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Doppler effect


The Doppler effect (redshift or blueshift) is used to measure the speed at which stars and galaxies are approaching or receding from earth.
  physics:  change in the apparent frequency of a wave as observer and source move toward or away from each other; the reason a fast-moving car that passes an observer has a higher pitch as it approaches and a lower pitch as it recedes
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Notes:
Also impacts electromagnetic waves.
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Samples:
  • The Doppler effect (redshift or blueshift) is used to measure the speed at which stars and galaxies are approaching or receding from earth.
  • "The Doppler Effect of Communication": There is always distortion between what a speaker says and what a listener wants it to mean.
    Amy Tan  --  The Bonesetter’s Daughter
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Associated words [difficulty]:   Doppler effect
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Most commonly used in these subjects:   Science, Engineering, Medicine
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