As a wave propagates:

Physics Wave and Sound General 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

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

Text Solution

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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.

For plane wavefront

I 11 = I 22

For point source

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

For a line source

because

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