Planck's quantum theory
When black body is heated, it emits thermal radiation's of different wavelengths or frequency. In order explain these radiations, the max planck put forward a theory known as planck's quantum theory.
(i) The radiant energy which is emitted or absorbed by the black body is not continuous but discontinuous in the form of small discrete packets of energy, each such packet of energy is called as 'quantum'. In the case of light, the quantum of energy is called a 'photon'.
(ii) The energy of each quantum is directly proportional to the frequency (v) of radiation,
Where, h Planck's constant = 6.62×10-27 erg. sec. or 6.62×10-34 Joules sec
(iii) The total amount of energy emitted or absorbed by a body will be some whole number quanta. Hence E= nhv where n is an integer.
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