As a wave propagates –

Physics Wave and Sound Mix MCQ (Single Correct)

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

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

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(a, c, d)

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

Fig.

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

Fig. Fig.

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