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Publishing of the Bohr model of the Atom
In 1913, Bohr published (under Ernest Rutherford's guidance) a paper which advanced Rutherford's previous model of the atom. The Bohr model not only correctly placed negatively charged electrons in orbit around a positively charged nucleus, as Rutherford's did, but also accounted for the stability of orbits and the ability of electrons to jump from one orbit to another. On the Constitution of Atoms and Molecules -
Formulation of the Correspondence Principle of Physics
Though he had used the idea before 1920, this is when he developed it fully. The Correspondence principle of physics states that classical physics and quantum mechanics will agree in their calculations of the behavior of a system which can be described with large quantum numbers.
Further Reading
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Complementarity
The principle of Complementarity was presented in a lecture given by Bohr in Italy on this date. He postulated the idea after he received a letter from Werner Heisenberg in regards to the latter's newly postulated uncertainty principle. Complementarity states that quantum objects have pairs of complementary properties, only one of which can be accurately measured at a time. It therefore gives a stronger explanation to support Heisenberg's uncertainty principle. -
Publishing of the Mechanism of Nuclear Fission
On this day, Bohr and his colleague from Princeton John Wheeler, jointly published a paper which described the action of atomic fission in Uranium isotopes. The paper used the liquid drop model of the atomic nucleus to explain the process of fission. The video linked below explains the basics of the principle. Video
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