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Definitions from the Web

Doppler Effect

Noun: The change in frequency or wavelength of a wave observed by an observer moving relative to the source of the wave.

Example sentences:

1. The doppler effect is responsible for the apparent change in pitch of a siren as an ambulance passes by.
2. Scientists use the doppler effect to study the motion of distant galaxies.

Synonyms for Doppler Effect:

• Redshift
• Blue-shift
• Compton Effect
• Beats