An infinite parallel planes with emissivities e1 and e2, the interchan – McqOptions

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1.	An infinite parallel planes with emissivities e1 and e2, the interchange factor for radiation from surface 1 to surface 2 is given by
A.	(e₁ + e₂)/ e₁ + e₂ - e₁e₂
B.	1/e₁ + 1/e₂
C.	e1 + e2
D.	e1e2
Answer» B. 1/e₁ + 1/e₂

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