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Question

Statement 1 : Emissivity of any body (e) is equal to its absorptivity power (a) at thermal equilibrium.
Statement 2 : The ratio of emissive power to the absorptive power is different for different bodies at a given temperature.

A
Statement 1 is true, statement 2 is false
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B
Statement 1 is false, statement 2 is true
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C
Both Statement 1 and statement 2 are true
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D
Both Statement 1 and statement 2 are false
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Solution

The correct option is A Statement 1 is true, statement 2 is false
According to Kirchoff's law,
The ratio of emissive power (E) to the absorptive power (a) is same for all bodies at a given temperature and is equal to emissive power of a black body.
E1a1=E2a2=Ebbabb=Ebb=constant
[For black body, abb=1]
E1Ebb=e=α1

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