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A stationary point source of sound emits...

A stationary point source of sound emits sound uniformly in all directions in a non absorbing medium. Two points P and Q are at a distance of 4 m and 9 m respectively from the source. The ratio of amplitudes of the waves at P and Q is

A

`1:2`

B

`1:4`

C

`4:1`

D

`2:1`

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The correct Answer is:
D
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