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The inverse square law of intensity (i.e., the intensity ∝ 1/r^2) is valid for a (a) point source (b) line source

Monjur Alahi

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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1 Answers

Salim Ahmed Kawsar

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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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