Sound WavesHard
Question
As a wave propagates
Options
A.the wave intensity is decreased as the inverse of the distance from source for a spherical wave
B.the wave intensity remains constant for a plane 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 centred at the source remains constant at all times
Solution
For a plane wave internsity (energy crossing per unit area per unit time) is constant at all points.
But for a special wave, intensity at a distance r from a point source of pwoer P (energy transmitted per unit) is given by
I =
or I ∝ 
Note : For a line source I ∝
because, I ∝
But for a special wave, intensity at a distance r from a point source of pwoer P (energy transmitted per unit) is given by
I =
or I ∝ Note : For a line source I ∝
because, I ∝
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