Q.

A black body at 227°C radiate heat at the rate of 7 cal/cm2s. At a temperature 727°C, the rate of heat radiated in the same unit will be :

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a

80

b

60

c

50

d

112

answer is D.

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Detailed Solution

E∞T4⇒7E2=50010004⇒E2=7×16=112.
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