Задача 50304.

There are two cavities 1 and 2 with the small holes of the same radius of 5 mm and totally reflecting outer surfaces. Cavity openings face each other, the distance between holes 100 mm. The cavity 1 is maintained in 1250 K. Find the temperature Set the temperature in the cavity 2. To consider that a black body radiator is a cosine.

Detailed recording solution, formulas and laws used in the decision, the withdrawal of the formula.
If you have any questions about the decision to write. I try to help.