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chemical engineering heat transfer
1. In thermal radiation for a black body (where, ε is emissivity and α is absorptivity)
(A): α ≠ 1, ε ≠ 1
(B): α ≠ 1, ε = 1
(C): α = 1; ε ≠ 1
(D): α = 1; ε = 1
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