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chemical engineering chemical engineering basics
1. For infinite parallel planes having emis-sivities ε1 & ε2, the interchange factor for radiation from surface 1 to surface 2 is given by
(A): ε1 + ε2
(B): ε1.ε2
(C): ε1.ε2/(ε1 + ε2 - ε1.ε2)
(D): (ε1 + ε2)/ε1.ε2
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