Question

what is the Dopper effect​

Answer 1

Explanation:

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.

Answer 2

Explanation:

The change in frequency or wave length of a wave for an observer who is moving relative to the wave source .

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