The thermal radiation emitted by a body is proportional to T^n , where T denotes its absolute temperature. The value of n equals exactly 4 for

Step-by-step solution

According to the Stefan-Boltzmann law, the total energy radiated per unit surface area per unit time by a perfectly black body is directly proportional to the fourth power of its absolute temperature. E = T^4 For a non-black body, the energy radiated is given by E = T^4 , where is the emissivity of the body. Since generally varies with temperature, the energy radiated by a non-black body is not exactly proportional to T^4 . Thus, n = 4 exactly for a blackbody.