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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 a distance of 9 meter and 25 meter, respectively, from the source. The ratio of amplitudes of the wave at P and Q is

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The correct Answer is:
`25:9`
`I prop ("amplitude")^(2)`
For point source `I prop (L//r^(2))`
`therefore` Amplitude `prop (L//r)`
`(A_1)/(A_2)=(r_2)/(r_1)=25/9`
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