Doppler effect

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Concise Oxford English Dictionary © 2008 Oxford University Press:
Doppler effect /ˈdɒplərɪfekt/ (also Doppler shift)

▶noun Physics an increase (or decrease) in the frequency of sound, light, or other waves as the source and observer move towards (or away from) each other.

– origin C19: named after the Austrian physicist Johann Christian Doppler.

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Doppler effect