Question

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)/ε₁.ε₂

b.

ε₁.ε₂/(ε₁ + ε₂ - ε₁.ε₂)

c.

ε₁.ε₂

d.

ε₁ + ε₂

Answer: (b).ε₁.ε₂/(ε₁ + ε₂ - ε₁.ε₂)

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Q. For infinite parallel planes having emis-sivities ε₁ & ε₂, the interchange factor for radiation from surface 1 to surface 2 is given by

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