What is Planck's law?
[[File:Black body.svg|thumb|250px|Planck's law (colored curves) accurately described black body radiation]] '''Planck's law''' describes the [[spectrum|spectral density]] of [[electromagnetic radiation]] emitted by a [[black body]] in [[thermal equilibrium]] at a given [[temperature]] ''T''. The law is named after [[Max Planck]], who proposed it in 1900. It is a pioneering result of modern [[physics]] and [[quantum mechanics|quantum theory]]. ==Related pages== * [[Blackbody radiation]] [[Category:Electromagnetic radiation]] {{physics-stub}}