Question

Which law gives the colour of the black body radiation?

Answer 1

Black-body radiation is the thermal electromagnetic radiation within or surrounding a body in thermodynamic equilibrium with its environment, or emitted by a black body It has a specific spectrum and intensity that depends only on the body's temperature, which is assumed for the sake of calculations

Answer 2

Stefan-Boltzmann law, statement that the total radiant heat power emitted from a surface is proportional to the fourth power of its absolute temperature. The law applies only to blackbodies, theoretical surfaces that absorb all incident heat radiation.