First slide

Radiation

Question

If the distance between a point source & absorber is halved then Intensity of radiant energy will be

Easy

A

Doubled
B

Quadrupled
C

Halved
D

increased to 16 times

Solution

For a point source, intensity (I) at a distance r is given by $I \propto \frac{1}{r^{2}}$ I^' = 4I

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