Thermal equilibrium has quite a long history: thermodynamics and statistical theory of gases etc. Hard to escape that each degree of freedom must have the same average energy.
Thermal equilibrium has quite a long history: thermodynamics and statistical theory of gases etc. Hard to escape that each degree of freedom must have the same average energy.
We look at the inside of the box through the little hole as we heat the oven,
dull red, cherry red, bright red, yellow, white-hot, bluish, etc.
but p, q, and r go up to infinity, more shorter and shorter wavelengths, or wavenumbers kx ky kz each go to infinity.
The number of k’s increases like the volume of a sphere, so they crowd to big values, predict most light is very blue.