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A point source emits sound equally in al...

A point source emits sound equally in all directions in a non-absorbing medium. Two point `P` and `Q` are at distance of `2 m` and `3 m` respectively from the source. The ratio of the intensities of the wave at `P` and `Q` is :

A

`9:4`

B

`2:3`

C

`3:2`

D

`4:9`

Text Solution

Verified by Experts

The correct Answer is:
A
Intensity `prop(1)/(r^(2))`
`implies (I_(1))/(I_(2))=((r_(2))/(r_(1)))^(2)=((3)/(2))^(2)=(9)/(4)`.
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