Plank's Law of radiation

"Max Karl Ernst Ludwig Planck was born in Kiel, Germany, on April 23, 1858, the son of Julius Wilhelm and Emma (née Patzig) Planck. His father was Professor of Constitutional Law in the University of Kiel, and later in Göttingen."
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 Max Planck in Germany examined the whole situation critically and put forward a bold new postulate(1900) that Linear Harmonic Oscillator(LHC) can have discrete energies.Which is

Another assumption was that change in energy of oscillator due to emission or absorption can also take place in discrete amount i.e by hv amount.
 Plank derived the value of h to be h=6.626*10^-27 ergs  which is known as Plank's constant.

Since radiation from oscillator is in discrete amount the photon will have hv amount of energy, which is equals to the loss of energy in the oscillator.According to Plank oscillators can exist in a set of discrete energy state i.e 0,hv,2hv,3hv,4hv.......,nhv.
                                                             E=nhv