A) initially it is the darkest body and at later times the brightest
B) it is the darkest body at all times
C) it cannot be distinguished at all times
D) initially it is the darkest body and at later times it cannot be distinguished
Correct Answer: A
Solution :
[a] According to Kirchoff?s law, good absorbers are good emitters as well. At high temperature (in the furnace), since it absorbs more energy, it emits more radiations as well and hence is the brightest.
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