Get the concept of: blackbody radiation, thermo-emf, the temperature dependence of resistance
Experiment: According to the Stefan-Boltzmann energy emitted by a blackbody per unit area per unit time is directly proportional to the fourth power of the absolute temperature of the body. This law is also valid for the so-called "gray" body whose surface has a coefficient of absorption, depending on the wavelength, less than 1. In this experiment, as a gray body supports thread incandescent lamp. The dependence of the radiation energy of this thread on the temperature.
