Day 186 of 365
July 5
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Physics The Doppler Effect
The Doppler Effect explains why a siren sounds higher as it approaches and lower as it moves away. This change in frequency occurs with any wave when the source moves relative to the observer. Astronomers use it to measure how fast distant galaxies are moving toward or away from us.
💡 Did you know?
Radar guns and weather radar both rely on the Doppler Effect to measure speed!
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