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A source sound is moving with constant v...

A source sound is moving with constant velocity of `20m//s` emitting a note of frequency `1000 Hz`. The ratio of frequencies observed by a stationary observer while the source approaching him and after it crosses him will be source is approaching him and after it crosses him will be

A

`9 : 8`

B

`8 : 9`

C

`1 : 1`

D

`9 : 10`

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The correct Answer is:
A
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