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sukhopar [10]
4 years ago
13

PLEASE HELP ME SOMEONE

Physics
1 answer:
sasho [114]4 years ago
7 0
I think its B or D, most likely D.
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Brrunno [24]

Answer:

1. Doppler Effect = The apparent change in frequency perceived when the source of sound is approaching or moving away from an observer

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Explanation:

I hope this helps. :)

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I'll assume you are looking for the mass of the object, since that is the missing piece of the puzzle.

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Mathematics and science
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