As a wave propagates:

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(D) The correct answer is $(d)$.For a plane wave,the wavefronts are parallel planes,and the energy is distributed uniformly,so the intensity remains c

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All of the above.

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(D) The correct answer is $(d)$.For a plane wave,the wavefronts are parallel planes,and the energy is distributed uniformly,so the intensity remains constant as the wave propagates.For a spherical wave,the energy emitted by the source spreads over an increasing surface area $A = 4\pi r^2$. Thus,the intensity $I = P / A = P / (4\pi r^2)$ is inversely proportional to the square of the distance $r$ from the source.The total power $P$ (often referred to as total intensity in this context) passing through any spherical surface centered at the source remains constant,as energy is conserved.

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