As a wave propagates in 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

For a travelling wave, the intensity of wave remains constant in a non absorbing medium if it is a plane wave.

Intensity of wave is inversely proportional to the square of the distance from the source if the wave is spherical
$(I = \frac{P}{4 {πr}^{2}})$
Intensity of spherical wave at all points on the spherical surface centered at source always remains same.

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