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Definition of the Doppler effect noun from the Oxford Advanced Learner's Dictionary

the Doppler effect

noun

/ðə ˈdɒplər ɪfekt/

/ðə ˈdɑːplər ɪfekt/

[singular] (physics)

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the way that sound waves, light waves, etc. change in frequency depending on the direction that the source is moving in relative to the person who is observing

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See the Doppler effect in the Oxford Advanced American Dictionary

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