An infinite parallel planes with emissivities e₁ and e₂, the interchange factor for radiation from surface 1 to surface 2 is given by

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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

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