Definition of Doppler effect in English:

Doppler effect

Line breaks: Dop|pler ef¦fect
Pronunciation: /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.
More example sentences
  • 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.
  • Basically the Doppler effect is that pitch increases the closer something gets to you, and it decreases the further away it gets.
  • In the astronomical setting, the Doppler effect applies to light.

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Word of the day conspicuous
Pronunciation: kənˈspikyo͞oəs
adjective
standing out so as to be clearly visible