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 wave
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 centered at the source remains constant at all times
Correct Answer: A
Solution :
For a travelling wave, the intensity of wave remains constant if it is a plane wave. Intensity of wave is inversely proportional to the square of the distance from the source if the wave is spherical \[\left( I=\frac{P}{4\pi {{r}^{2}}} \right)\] Intensity of spherical wave on the spherical surface centred at source always remains same. Here total intensity means power \[P\].You need to login to perform this action.
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