InterviewSolution
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InterviewSolution
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As a wave propagates,A. (a) the wave intensity remains constant for a sine waveB. (b) the wave intensity decreases as the inverse of the distance from the source for a spherical waveC. (c ) the wave intensity decreases as the inverse square of the distance from the source for a spherical waveD. (d) total intensity of the spherical wave over the spherical surface centered at the source remains constant at all times. |
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Answer» Correct Answer - A::C::D (a,c,d) For a plane wave, intensity (energy crossing per unit area per unit time) is constant at all points. But for a spherical wave, intensity at a distance `r` from a point source of power `(P)`, is given by `I = (P)/(4pir^(2))` rArr `I prop (1)/(r^(2))` But the total intensity of the spherical wave over the spherical surface centered at the source remains constant at all times. |
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