35. The metal surface area of S = 10 cm2 and heated to a temperature T = 2.5 kK emits in one minute 60 kJ. Determine: 1) energy emitted by this surface, including its black; 2) the ratio of the irradiance of the surface and the black body at a given temperature.

Detailed solution. Decorated in Microsoft Word 2003. (Target decided to use formula editor)