[복사열전달] Spectral emission and absorption

A black sphere of very high conductivity (isothermal) is orbiting earth. (a) What is its temperature? (Consider the sun but neglect radiation from the earth and the stars). (b) What would be the temperature of the sphere if it were coated with a material that behaves like a black body for wavelengths between 0.4 µm and 3 µm, but does not absorb and emit at other wavelengths? (a) 열평형상태에서는 방출되는 에너지와 흡수하는 에너지가 같다. 방출되는 에너지를 Qe, 흡수되는 에너지를 Qa라 하면, 여기서 Qe에는 지구의 표면적을, Qa에는 지구의 단면적(투영면적)을 적용하는 것에 유의한다. ...

원문링크 : [복사열전달] Spectral emission and absorption