A spherical body is enclosed in a spherical chamber which acts like a perfectly black body. The reflectance of the body is 0.4 and transmittance is negligible, the temperature of the body and surrounding temperature is constant at T Kelvin. The total power that comes out of the body per unit area is?
The Attempt at a Solution
reflectance is 0.4 so emissivity is 0.6, power radiated by body per unit area is 0.6σT^4 but the correct answer is σT^4- where am I wrong? I think the reflected radiation shouldn't be counted as coming "out" from the body