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As a wave propagates-

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The wave intensity decreases as the inverse of the distance from the source for a spherical wave

The wave intensity remains constant for a plane wave

The wave intensity decreases as the inverse of the distance for a line source

The wave intensity decreases as the inverse square of the distance from the source for a spherical wave

answer is A, C, D.

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Detailed Solution

For a plane wave intensity (energy crossing per unit area per unit time) is constant at all points.

But for a spherical wave, intensity at a distancer $r$ from a point source of power $P$ (energy transmitted per unit time) is given by

$I = \frac{P}{4 {πr}^{2}} or I \propto \frac{1}{r^{2}}$

For a line source $I \propto \frac{1}{r}$

because $I = \frac{P}{πrl}$

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