| quantum mechanics | Planck | Physics theory that explains wave-particle duality, the uncertainty principle and the exclusion principle. | Any physical system, such as an atom, may be viewed as existing as a combination of its possible states, each of which has a certain probability. | microscopic scales of atoms and subnuclear particles but not restricted to this | certain quantities (e.g. energy, angular momentum, light) can only exist in certain discrete amounts, called quanta. | physical systems must be described in terms of probabilities. | quantum theory |
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