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Q.

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

answer is C.

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Detailed Solution

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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