Thermal Properties of Matter - Result Question 26

27. A black body at 227C radiates heat at the rate of 7cals/cm2s. At a temperature of 727C, the rate of heat radiated in the same units will be:

(a) 50

(b) 112

(c) 80

(d) 60

[2009]

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Answer:

Correct Answer: 27. (b)

Solution:

  1. (b) According to Stefan’s law E=σT4,

T1=500K

T2=1000K

E2E1=(T2T1)4=(1000500)4=16

E2=16×7=112cal/cm2s



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