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Question

Two identical objects A and B (emissivity eA and eB ;eAeB) are placed in an enclosure. Temperature of body A, B and enclosure are same and constant.
 


A
heat emitted by body 'A' is not equal to heat emitted by body B. 
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B
heat absorbed by body 'A' is not equal to heat absorbed by body B.
 
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C
If eA>eB, body A absorbs more heat than body B    
 
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D
If eA<eB, body A emits less heat than body B.
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Solution

The correct option is D If eA<eB, body A emits less heat than body B.
Emissivity is defined as the ratio of the energy radiated from a material's surface to that radiated from a blackbody at the same temperature and wavelength and under the same viewing conditions.
So, if eA<eB, body A emits less heat than body B.

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