单词 | Doppler effect |
释义 | Doppler effect/ˈdɒplərɪfɛkt /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. The effect causes the sudden change in pitch noticeable in a passing siren, as well as the red shift seen by astronomers.The normal Doppler effect causes sound waves to get longer if the source of the sound is moving away - for example, a receding ambulance siren....
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