PROGRESS OF QUANTUM THEORY

1. In 1905, Einstein explained the photoelectric theory using Planck’s Quantum Theory.

2. After the discovery of an electron, radioactivity in which a - and b - particles and g - rays are emitted was discovered. From the knowledge that the atom is neutral, it was concluded that the positive and negative charges in an atom must be in equal amount.

3. Thomson and then Rutherford gave the model of an atom. Later, in 1913, Bohr introduced quantum theory to explain the structure of the atom.

4. Frank and Hertz provided experimental support to Bohr’s theory.

5. In 1916, Einstein proposed that the photon also possesses quantized momentum.

6. In 1923, Compton gave an experimental support to the photon theory by attributing the properties of a particle to a photon.

7. In 1923, De-Broglie hypothesized wave nature of material particles.

8. In 1927, Davisson and Germer gave experimental proof of De Broglie’s matter waves.

9. Heisenberg gave uncertainty principle and Schrodinger established a differential equation to understand the behavior of matter particles and within six months solved some problems regarding them.

10. Max Born and Dirac also contributed in the development of quantum mechanics.

11. The relativistic quantum mechanics was also developed. Einstein’s theory of relativity also played a useful role in the development of the modern physics.