PHYSICS · Single correct · A Level · Physics · Waves · Waves
Problem
As a wave propagates,
(1) the wave intensity remains constant for a plane wave
(2) the wave intensity decreases as the inverse of the distance from the source for a spherical wave
(3) the wave intensity decreases as the inverse square of the distance from the source for a spherical wave
(4) total intensity of the spherical wave over the spherical surface centred at the source remains constant at all times.