The thermal radiation emitted by a body is proportional to Tn where T is its absolute temperature. The value of n is exactly 4 for
bodies painted black only
polished bodies only
From Stefan-Boltzmann law, the energy of the thermal radiation emitted per unit time by a blackbody of surface area A is given by `u = σAT^4` here , σ is Stefan-Boltzmann constant.
This law holds true for all the bodies.
Video Tutorials For All Subjects
- Qualitative Ideas of Blackbody Radiation