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Wednesday, November 16, 2011

Period Of Modern Physics

1. Crooke discovered cathode rays in 1878. J.J Thomson showed experimentally that Cathode Rays are negatively charged particles called electrons.
2. Lorentz formulated an electron theory of matter according to which vibrating electrons should emit. Electromagnetic radiations.
3. In 1895, Rontgen discovered x-rays.
4. In 1896, Becquerel discovered x-rays.
5. Planck introduced the Quantum theory of light.
6. In 1905, Einstein published his special Theory of Relativity.
7. In 1911, Rutherford proposed a model of atom, similar to solar system.
8. In 1913, Bohr gave his atomic model which proved very helpful in explaining the atomic spectra of hydrogen.
9. Quantum and relativistic Physics have completely revolutionised our concepts in physics.
10. During the 1920 more advances were made in electronics, spectroscopy and nuclear physic..
11. 1913,
compton proved experimentally the particle nature of light.
12. 1924, de Broglie introduced wave mechanics.
13. In 1927 and 1928, Davison and G.P. Thomson proved experimentally that electrons also behave like waves.
14. In 1932,
(a) Chadwick discovered the neutron
(b) Lawrence invented Cyclotron.
15. In 1934, Joliot and his wife Iren Curie discovered artificial radio activity. Fermi and others produced artificial rodioactivity neutron capture.
16. In 1938, Hahn discovered nuclear fission which is the basis of the atomic bomb.
17. In 1949, John Bardeen invented the transistor which revolutionized the modern electronics. On this he was awarded the 1956 Nobel Prize in physics along with Walter Brattain and William Shockley.
18. In 1986, Muller and Bendoz discovered high temperature superconductivity.
19. In this modern age physicists are engaged in research in almost every field of science. This is age of group research rather than individual.

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