MHT CET Physics question

As a wave propagates, which of the following is a wrong option?

(A)The wave intensity remains constant for a plane wave
(B)The wave intensity decreases as the inverse of the distance from the source for a spherical wavesCorrect
(C)The wave intensity decreases as the inverse square of the distance from the source for a spherical wave
(D)Total intensity of the spherical wave over the spherical surface remains constant at all times, while source is at the centre of spherical surface

Answer: (B)

Solution

For a spherical wave the power is spread over an area , so intensity falls as and statement (b) () is wrong; (a), (c)

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Question ID VK-070203