Question

What is Quantum theory of radiation ? Derive Planck's
formula for the distribution of energy in the spectrum
of a black body. Deduce from it Wein's displacement
law and Rayleigh Jean's law.​

Answer 1

Wien's Law. Here, lambda max (in meters) is equal to a constant, b, divided by a temperature, T (in kelvin). The constant has a value of 2.9 * 10^-3 m K. It is important to note that Wien's law gives you wavelength of maximum emission in meters.

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.