1.

An infinite parallel planes with emissivities e‚ÇÅ and e‚ÇÇ, the interchange factor for radiation from surface 1 to surface 2 is given by#

A. (e‚ÇÅ + e‚ÇÇ)/ e‚ÇÅ + e‚ÇÇ - e‚ÇÅe‚ÇÇ
B. 1/e‚ÇÅ + 1/e‚ÇÇ
C. e‚ÇÅ + e‚ÇÇ
D. e‚ÇÅe‚ÇÇ
Answer» B. 1/e‚Äö√á√Ö + 1/e‚Äö√á√á


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