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)/ε₁.ε₂
B. Ε₁.ε₂/(ε₁ + ε₂ - ε₁.ε₂)
C. Ε₁.ε₂
D. Ε₁ + ε₂
Answer» C. ≈í√Ø‚Äö√á√Ö.≈í¬µ‚Äö√á√á


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