Actually for a true "point source" it is 1/r^3 , for a linear source it is 1/r^2 and for a planar source it is 1/r, if I recall my (least) most favorite class of 45 years ago. -- The difference between genius and stupidity is that genius has its limits.
Actually for a true "point source" it is 1/r^3 , for a linear source it is 1/r^2 and for a planar source it is 1/r, if I recall my (least) most favorite class of 45 years ago.
1/r^2 for point, 1/r for line, constant for infinite plane.
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