PLANCK’S QUANTUM THEORY – Quantization of Energy
This theory was proposed in 1900 by the German physicist Max Planck to account for the observed radiations from heated bodies.
Max Planck suggested that the energy could not be absorbed or emitted by the atoms in any arbitrary quantity, but only in specified amounts called quanta.
That is to say, an atom cannot change its energy continuously but only by a series of steps. The amount of energy depends upon the frequency ( u ) of radiation absorbed or emitted. It is given by relation:
E = h u where h = Planck’s constant (6.625 x l0-34 J.S. = 6.625 x l0-27 erg. sec.)
The main consequence of Planck’s quantum theory is that the amount of energy gained or lost is quantized i.e., energy change occurs in small packets or multiple of those packets, h u, 2hu, 3hu and so on.