1. The problem statement, all variables and given/known data A spherical body of area A and emissivity 0.6 is kept inside a perfectly black body. Total heat radiated by the body at temperature T is (A) 0.4σAT4 (B) 0.8σAT4 (C) 0.6σAT4 (D) 1.0σAT4 2. Relevant equations Stefan-Boltzmann's Law: P = AεσT4 3. The attempt at a solution If it wasn't inside the black body, the answer would be (C). But it is inside one and I don't know what to do about it. Wouldn't the black body just absorb all the power radiated? We also don't know what temperature the black body is. And the question asks for total heat radiated, not power which is confusing because the answers will have dimensions of power, unless they've just omitted saying total heat per second. Honestly, I've always been a bit confused with emissivity and absorptivity. Please help.