As a wave propagates

Options

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 ofthe distance from the source for a spherical wave
D. Total power of the spherical wave overthespherical surlace centred at the source remains constant at all times

Answer

A, C, D

Explanation

For a plane wave (One dimensional) the wave amplitude and intensity remains constant during propagation. For a point source of spherical wave the wave intensity is given as `I = P //pir^(2)` where P is the source Power which remain constant for the whole spherical wave front of the wave all the time.