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A wall is moving with velocity u and a s...


A wall is moving with velocity u and a source of sound moves with velocity `(u)/(2)` in the same direction as shown in the figure. Assuming that the sound travels with velocity `10u`, the ratio of incident sound wavelength on the wall to the reflected sound wavelength by the wall is equal to

A

`9:11`

B

`11:9`

C

`4:5`

D

`5:4`

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The correct Answer is:
A
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