Quantum mechanics

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In the microscopic world, physics is based on the theory that light, electrons, etc. have a face as "particle" and a face as "wave". Built in the mid 1920's, it brought a world image different from classical mechanics, which can clearly predict one physical state. The state of the particles is superimposed and the appearance is represented as a wave. However, when the particles are observed, the overlap disappears, and one state can be seen. At the core is W. Heisenberg's principle of uncertainty, in which you can not know exactly both the particle position and momentum, time and energy, etc. A. A theory that represents the twentieth century physics as well as Einstein's relativity. N. Bohr, Heisenberg, E. Schrodinger, P. Dirac et al. Were established with the collective power of physicists. In recent years, with advances in experimental technology, the world image becomes more realistic. From the practical point of view, it produces semiconductor physics and has become the foundation of information technology (IT).