As a wave propagates

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

The wave intensity remains constant for a plane wave

Total power of the spherical wave over the spherical surface centered at the source remains constant at all times

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 (one dimensional) the wave amplitude and intensity remain constant during propagation. For a point source of spherical wave the wave intensity is given as $I = P / 4 {πr}^{2}, I \propto \frac{1}{r^{2}}$ where P is the source power which remain constant for the whole spherical wave front of the wave all the time. A, C, D are correct.

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