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Doppler Effect (Noun)

Meaning

Change in the apparent frequency of a wave as observer and source move toward or away from each other.

Classification

Nouns denoting natural phenomena.

Examples

  • The police officer used a radar gun to measure the speed of the car based on the Doppler effect of the returned signal.
  • The change in pitch of the siren as the ambulance sped by was an example of the Doppler effect in action.
  • Astronomers use the Doppler effect to calculate the velocity of celestial objects moving away from or towards Earth.
  • The Doppler effect is commonly observed in the change in tone of a train's whistle as it passes a stationary observer.
  • Meteorologists rely on the Doppler effect to measure wind velocity and direction by analyzing the frequency shift of radar signals scattered by particles in the air.

Synonyms

  • Doppler Shift
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