Question
In thermal radiation for a black body (where, ε is emissivity and α is absorptivity)
Options:
A .  α = 1; ε ≠ 1
B .  α ≠ 1, ε = 1
C .  α ≠ 1, ε ≠ 1
D .  α = 1; ε = 1
Answer: Option D
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