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Question
According of Kirchhoff's law
Options:
A .  Radiant heat is proportional to fourth power of absolute temperature
B .  Emissive power depends on temperature
C .  Emissive power and absorptivity are constant for all bodies
D .  Ratio of emissive power to absorptive power for all bodies is same and is equal to the emissive power of a perfectly black body
Answer: Option D

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