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As a wave propagatesin a non absorbing medium

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the wave intensity remains constant for a plane wave.

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

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

total intensity of the spherical wave over the spherical surface centered at the source remains constant at all times.

answer is A, C, D.

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Detailed Solution

Wavefronts of waves emerging from a point source are spherical. If P be the power emitted by the source , then I= $\frac{P}{4 {πr}^{2}}$ .

For a plane wave , lines of propagation are parallel , so energy passing through unit area per unit time remains the same at all positions .

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