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  4. The relation between the intensity (I) of a wave and on the distance (r) from a line source is

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Q. The relation between the intensity (I) of a wave and on the distance (r) from a line source is

Waves

Solution:

For a line source intensity, $I=\frac{p}{A}=\frac{p}{(2 \pi r)} v$
$\therefore I \propto \frac{1}{ r }$,