Hi guys,
Let's assume I have a point source in a free field. Now, correct me if I'm wrong on any of the following points:
Stewart
Let's assume I have a point source in a free field. Now, correct me if I'm wrong on any of the following points:
 As the spherical waves spread out from the point source, they will tend towards plane waves.
 Since planes waves lose less intensity with distance than spherical waves (due to wavefront area not increasing), the rate at which the intensity falls will decrease with distance.
 A graph will look like the attachment. The black line is for an ideal point source where the waves stay spherical with distance, the blue line for the situation I've described.
Stewart
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