As a wave propagates (i) the wave inte...

As a wave propagates
(i) 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
(iii) the wave intensity decreases as the inverse square of the distance from the source for a spherical wave
(iv) total intensity of the spherical wave over the spherical surface centred at the source remains constant at all times

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