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A black body at a temperature of 2270C radiates heat at the rate of 20calm-2 s-1. When its temperature rises to 7270C the heat radiated will be

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a
40 units
b
160 units
c
320 units
d
640 units

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detailed solution

Correct option is C

Heat radiated by black bodyE=σAT4⇒EαT4 or E1E2=T14T24  or 20E2=50010004=124=116 ⇒E2=16×20calm-2 s-1 =320calm-2 s-1


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