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Which one please hurry . And please be right ..
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3 votes
Which one please hurry . And please be right ..

Which one please hurry . And please be right ..-example-1
User Dkol
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3 votes
i think it is only the source is in motion
User Louis Brahmi
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Answer:

IN MOTION

Step-by-step 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.

User Charles Li
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