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Question

The rate of emission of radiation of a black body at 273C is E, then the rate of emission of radiation of this body at 0C will be


A
E16
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B
E4
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C
E8
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D
0
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Solution

The correct option is B E16
The ratio of energy emission will be directly proportional to fourth power of temperature ratio can be found out from given data.
ΔQ2ΔQ1=σAT42σAT41
T1=273+273K=546K;T2=273K
substituting the temperature values in the Stefan's law
ΔQ2ΔQ1=σA2734σA5464=124

ΔQ2=ΔQ116
Thus the correct answer is A.

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