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Doppler Effect

Definition:

The Doppler effect refers to the change in frequency or wavelength of a wave as perceived by an observer moving relative to the source of the wave. It occurs for all types of waves, including sound and light, and is often observed in everyday life.

Sample Sentences:

• The sound of an approaching ambulance siren is higher in pitch due to the Doppler effect.
• The Doppler effect is used in weather radar to determine the speed and direction of precipitation.
• Astronomers study the Doppler effect to analyze the motion and properties of celestial objects.
• Police officers use the Doppler effect to measure the speed of moving vehicles using radar guns.
• The Doppler effect can be demonstrated by observing the changing pitch of a train horn as it passes by.

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