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Niels Bohr (1885–1962)

Autor(a) de Essays 1932-1957 on Atomic Physics and Human Knowledge

44+ Works 423 Membros 3 Críticas 4 Favorited

About the Author

A pioneer in the field of quantum mechanics and nuclear fission, Niels Bohr is considered one of the most important theoretical physicists of the twentieth century. He was born in Copenhagen, Denmark, in 1885, into a distinguished scientific family. After receiving his Ph.D. in 1911, Bohr went to mostrar mais England to work with Joseph John Thomson, discoverer of the electron, and later with Ernest Rutherford, who, in 1911, had shown that the atom consists of a small central nucleus surrounded by relatively distant electrons. At this time, the process involving electron orbits and energy transfer was not well understood due to the limitations of classical electrodynamics. In 1913, Bohr elucidated the process by proposing an explanation based on earlier research of Max Planck, who had argued that radiation is emitted or absorbed by atoms in discrete units of quanta of energy. Bohr proposed that electrons exchange energy in quanta. By applying quantum theory to the atom, he derived a theoretical formula for the spectral lines in hydrogen, long observed but never explained. Bohr's formula matched the empirical formula, thus verifying the theory. For this accomplishment, Bohr received the Nobel Prize in physics in 1922. Among Bohr's many contributions to the early development of quantum theory was his formulation of the correspondence principle in 1916 and the complementarity principle in 1927. The former principle requires that the quantum theoretical description of the atom correspond to classical physics at large magnitudes. The second principle states that it is impossible to distinguish between the actual behavior of atomic objects and their interaction with the measuring instrument. In 1910, the government of Denmark created the Institute for Theoretical Physics to facilitate Bohr's research. Bohr served as its director until his death. The institute under Bohr's leadership became a world center for the exchange of ideas and information on nuclear physics. Bohr was president of the Royal Danish Academy of Sciences from 1939 until his death. When the Germans occupied Denmark in 1940, Bohr became active in the resistance movement. In 1943, he and his family escaped to Sweden in a fishing boat and then to the United States to assist in developing the atomic bomb at Los Alamos, New Mexico, on the Manhattan Project. After the war, he became a passionate advocate of nuclear disarmament. In 1952 Bohr helped create the European Centre for Nuclear Research (CERN) in Geneva, Switzerland. In 1955, he organized the first Atoms for Peace Conference in Geneva. Bohr died in 1962. (Bowker Author Biography) mostrar menos
Image credit: George Grantham Bain Collection, Library of Congress Prints and Photographs Division, Reproduction Number: LC-DIG-ggbain-35303

Séries

Obras por Niels Bohr

I quanti e la vita (1969) 21 exemplares
Causality and Complementarity (1934) 10 exemplares
Collected works (1972) 7 exemplares
Filosoofilised mõtted (2017) 2 exemplares
Atomer og kerner (1985) 2 exemplares

Associated Works

Niels Bohr: A Centenary Volume (1985) — Contribuidor — 59 exemplares
The Penguin Book of Twentieth-Century Protest (1998) — Contribuidor — 31 exemplares

Etiquetado

Conhecimento Comum

Membros

Críticas

This is a publication of a selection of Bohr's papers from the years 1914-1921 and was simultaneously published in English as "The theory of spectra and atomic constitution" by Cambridge University Press. See Pais, "Niels Bohr's Tmes", p. 195..
In these papers, Bohr laid out the connection between atomic spectral transitions and the positions of the elements in the periodic table.
 
Assinalado
hcubic | Mar 29, 2020 |
fisica quantistica, 7=A=845
 
Assinalado
amorano | 1 outra crítica | Jan 30, 2012 |

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Estatísticas

Obras
44
Also by
3
Membros
423
Popularidade
#57,688
Avaliação
½ 3.6
Críticas
3
ISBN
72
Línguas
14
Marcado como favorito
4

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