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Q.

The total radiant energy per unit area, normal to the direction of incidence, received at a distance R from the centre of a star of radius r, whose outer surface radiates as a black body at a temperature T K is given by :

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a

4πσr2T4R2

b

σr2T4R2

c

σr2T44πr2

d

πr4T4r4

answer is B.

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Detailed Solution

Total radiant energy per unit area =σ(4πr2)T44πR2
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