The inverse square law of intensity (i.e., the intensity ∝ 1/r^2) is valid for a (a) point source (b) line source
The inverse square law of intensity (i.e., the intensity ∝ 1/r2) is valid for a
(a) point source
(b) line source
(c) plane source
(d) cylindrical source.
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(a) point source
EXPLANATION:
Only for a point source the intensity can be written as I = E/4πr², where E is the strength of the source. Hence E ∝ 1/r².
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