Definitions for

**"Planck's Law"**The relationship between the wavelike and particle-like ( photon) properties of Electromagnetic radiation. E = hf, where E is the energy of the photon, h is the Planck constant and f is the frequency of the wave.

formula giving the relation between the temperature and the energy emitted by a blackbody at any wavelength.

(physics) the basis of quantum theory; the energy of electromagnetic waves is contained in indivisible quanta that have to be radiated or absorbed as a whole; the magnitude is proportional to frequency where the constant of proportionality is give by Planck's constant