Classical Mechanics Inadequacy

Prior to 1900 most of the phenomena involving macroscopic systems could be explained satisfactorily with the accepted laws of classical physics. In most of the cases, the effects with which the classical theory is associated are either directly observable or capable of observation with the help of simple instruments. There is also a close link between the world of sensory perception and the realm of classical physics.

With the discovery of electron as a fundamental particle by J.J. Thomson in 1897, most of the studies in Physics were concentrated to explore microscopic or atomic systems which are beyond the scope of direct observation. Many difficulties were encountered with phenomena such as spectral distribution of heat radiations from black bodies, specific heats of solids at low temperature etc.

These difficulties were overcome by Planck in 1900 who suggested that the black body radiation (emission or absorption of electromagnetic radiations) takes place as discrete quanta and the energy equivalent of each quantum, E = hv.

The quantum concept was also used by Einstein to explain the observed photo-electric effect. Thus a dual character of electro-magnetic radiation that it behaves as waves and particles became evident.

The concept of discrete energy levels has become very fundamental in the field of atomic and nuclear physics and it is a consequence of Planck’s hypothesis of quanta of energy.

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