AIPMT PRELIMS2009Physics-Thermodynamics
AIPMT PRELIMS 2009 Physics Black Body Radiation MCQ Question
Type: MCQ-conceptual-Medium-Class 11
A black body at 227°C radiates heat at the rate of 7 Cals/cm²s. At a temperature of 727°C, the rate of heat radiated in the same units will be:
A
50
B
112
C
80
D
60
Correct Answer
Option B
Detailed Explanation
The rate of heat radiation is proportional to the fourth power of the absolute temperature (Stefan-Boltzmann law). Calculating the ratio of temperatures and applying the law gives the rate as 112 Cals/cm²s.
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