1925
Atomic  


New foundations are laid for quantum mechanics.

New foundations are laid for quantum mechanics. The German physicist Werner Heisenberg invents matrix mechanics to account for the discrete quanta of light emitted and absorbed by atoms. His idea provides a framework for the new quantum physics. In 1927 Heisenberg states his quantum Uncertainty Principle, that it is impossible to exactly measure the position and momentum of a particle at the same time.
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