Q.

The net radiant interchange per square metre for two large parallel planes at temperatures of 1000?K and 100?K respectively, would be roughly

A. 240 kcal/hr
B. 75 kcal/hr
C. 25 kcal/hr
D. 480 kcal/hr
E. 120 kcal/hr
Answer» C. 25 kcal/hr
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