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natka813 [3]
3 years ago
12

Which one please hurry . And please be right ..

Physics
2 answers:
Elis [28]3 years ago
8 0

Answer:

IN MOTION

Explanation:

An apparent change in the frequency of waves, as of sound or light, occurring when the source and observer are in motion relative to each other, with the frequency increasing when the source and observer approach each other and decreasing when they move apart.

Likurg_2 [28]3 years ago
5 0
I think it is only the source is in motion
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