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Topic: Niels Bohr


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  Niels Bohr: Tutte le informazioni su Niels Bohr su Encyclopedia.it   (Site not responding. Last check: 2007-10-21)
Bohr concepì il principio di complementarità: sistemi che hanno proprietà in contraddizione fra loro possono essere considerati separatamente.
Bohr trovò anche applicazioni filosofiche a questo strano principio, che fu anche il motivo di famose discussioni con Albert Einstein, che invece preferiva la chiarezza della fisica classica rispetto ai nuovi concetti quantistici.
Appunto con Heisenberg, ebbe un incontro nel 1941; in quell'incontro potrebbe aver ottenuto informazioni sul piano nucleare tedesco, a cui Heisenberg lavorava.
www.encyclopedia.it /n/ni/niels_bohr.html   (518 words)

  
 Niels Bohr Encyclopedia Article @ NaturalResearch.org (Natural Research)   (Site not responding. Last check: 2007-10-21)
On the basis of Rutherford's theories, Bohr published his model of atomic structure in 1913, introducing the theory of electrons traveling in orbits around the atom's nucleus, the chemical properties of the element being largely determined by the number of electrons in the outer orbits.
In 1916, Niels Bohr became a professor at the University of Copenhagen, and director of the newly constructed "Institute of Theoretical Physics" in 1920.
Niels Bohr on the 500 Danish Kroner banknote.
www.naturalresearch.org /encyclopedia/Niels_Bohr   (1836 words)

  
 Copenhagen . Niels Bohr | PBS
Bohr postulated that radiation is emitted from atoms not as a result of the periodic motion of the electron in its orbit, but only when an electron "jumps" from one orbit to another losing energy that is emitted as radiation.
Bohr's theory of the compound nucleus, in which the repulsion between positively charged protons is countered by huge amounts of energy in order to hold the nucleus together, helped lead to the hypothesis that splitting an atom would produce enough energy to fabricate a powerful weapon.
Niels Bohr died in 1962 and is buried in Copenhagen.
www.pbs.org /hollywoodpresents/copenhagen/story/bohr.html   (558 words)

  
 [No title]   (Site not responding. Last check: 2007-10-21)
Niels Henrik David Bohr (October 7, 1885 - November 18, 1962) was a Danish physicist.
Based on Rutherford's theories, Bohr published his Bohr model about atom structure in 1913, introducing the theory of electrons travelling on orbits around the atom's nucleus, with the outer orbits holding more electrons than the inner ones, thereby determining the chemical properties of the atom.
In 1916, Bohr became professor at the University of Copenhagen, and director of the newly constructed "Institute of Theoretical Physics" in 1920.
wikiwhat.com /encyclopedia/n/ni/niels_bohr.html   (560 words)

  
 Niels Bohr
Bohr's father, Christian Bohr, professor of physiology at the University of Copenhagen, was known for his work on the physical and chemical aspects of respiration.
Bohr distinguished himself at the University of Copenhagen, winning a gold medal from the Royal Danish Academy of Sciences and Letters for his theoretical analysis of and precise experiments on the vibrations of water jets as a way of determining surface tension.
Bohr was among the first to see the importance of the atomic number, which indicates the position of an element in the periodic table and is equal to the number of natural units of electric charge on the nuclei of its atoms.
www.crystalinks.com /bohr.html   (2000 words)

  
 Niels Bohr   (Site not responding. Last check: 2007-10-21)
Niels Bohr was a theoretical physicist who made significant contributions to the field of quantum mechanics.
Niels Bohr was born on October 7, 1885 in Copenhagen, Denmark.
Niels Bohr theorized and was able to prove that the internal structure of a nucleus is a complex, compound structure inside an atom.
www.usd.edu /phys/courses/phys300/gallery/clark/bohr.html   (689 words)

  
 Niels Henrik David Bohr
When Niels was only a few months old his father Christian had been appointed as a lecturer to fill a post left vacant by the death of Peter Panum, the professor of physiology at the University of Copenhagen, and a short while later the family moved into the Panum's professorial house in Copenhagen.
Bohr applied to the Carlsberg Foundation for a travel grant in May 1911 and, after the award was made, went to England in September 1911 to study with Sir J J Thomson at Cambridge.
Bohr's other major contributions, in addition to quantum theory, include his theoretical description of the periodic table of elements around 1920, his theory of the atomic nucleus being a compound structure in 1936, and his understanding of uranium fission in terms of the isotope 235 in 1939.
www.jewishvirtuallibrary.org /jsource/biography/Bohr.html   (2671 words)

  
 NBI Today and previously.
Niels Bohr returned to Denmark in August 1945 and immediately began to plan an extension of the Institute to permit active participation in nuclear research which was rapidly developing.
Bohr's lectures, composed with tremendous labour, were indeed masterpieces of allusive evocation of a subtle dialectic; the trouble was that the audience was usually unprepared to catch subtle allusions to conceptions and arguments which were anyhow unfamiliar and hard to grasp.
Bohr intervened with a soothing pronouncement about how hard it was to imagine how the behaviour of the electron could be described beyond the limit where correspondence with the classical point-charge picture afforded legitimate guidance; we must here be prepared for further renouncement in the application of classical concepts.
www.nbi.dk /nbi-history.html   (6277 words)

  
 Niels Bohr
Bohr concentrated the majority of his effort on researching the structure of the atom, and in 1913 he completed his theory of atomic structure.
Bohr was traveling to the United States when Frisch was conducting his experiment but Bohr learned of the results while in route and immediately came up with a theory.
Bohr was very concerned about the atomic bomb and tended to view the bomb as device that could unify nations, since it could after all, cause catastrophic damage.
www.cord.edu /faculty/ulnessd/legacy/fall2000/pfeifer/nielsbohr.htm   (1126 words)

  
 Niels Bohr | Biography | atomicarchive.com
Niels Henrik David Bohr was born in Copenhagen in 1885 to Christian Bohr, a professor of physiology at the University of Copenhagen and a Nobel Prize winner, and Ellen Adler Bohr, who came from a wealthy Sephardic Jewish family prominent in Danish banking and parliamentary circles.
After 1930, Bohr's activities in his Institute were focused on research on the constitution of the atomic nuclei and of their transmutations and disintegrations.
Bohr and his wife Margrethe had six children, one of whom, Aage Niels Bohr, became a very successful physicist and also won a Nobel Prize.
www.atomicarchive.com /Bios/Bohr.shtml   (456 words)

  
 Niels Bohr Homepage
Niels Bohr was one of the key physicists of the 1900s.
Niels Henrik David Bohr was born on October 7, 1885, in Copenhagen, Denmark.
Bohr’s model of the atom proved essentially correct, and he won the Nobel Prize for his quantum theory studies in 1922.
www.angelfire.com /scifi/concordiasci/bohr.html   (780 words)

  
 Niels Bohr | Physicist
Bohr became a professor of physics at the University of Copenhagen in 1916.
In 1920 Bohr was named director of the newly constructed Institute of Theoretical Physics at the University.
Bohr became a Fellow of the Royal Society of London in 1926, receiving the Royal Society Copley Medal in 1938.
www.lucidcafe.com /library/95oct/nbohr.html   (662 words)

  
 Niels Bohr: The Atomic Bomb and Beyond
But Bohr was also one of the most foresighted of men, and one of the few who not only thought ahead about the post-World War II implications of the atomic bomb but who personally urged President Franklin Roosevelt and Prime Minister Winston Churchill to prepare for the nuclear future.
Bohr became one of the key fission researchers, determining in 1939 that the rare U-235 isotope was the isotope that made uranium fissionable and which made a chain reaction theoretically possible.
Bohr was surprised; he later wrote: "...it was a revelation to me to learn...about the advanced stage the work had already reached" (J. Robert Oppenheimer papers, Box 34, Bohr memorandum to President Roosevelt, July 3rd, 1944, Library of Congress).
www.doug-long.com /bohr.htm   (1791 words)

  
 Niels Bohr
In one of Bohr's successful attempts at this, he was especially pleased to note that Einstein had forgotten that according to his own theory of general relativity clocks run more slowly under the influence of a gravitational field.
Bohr said that many non-radiating orbits were allowed, each one having an integral factor of the basic unit of angular momentum, h/2*pi.
Bohr's "Copenhagen school" produced the famous "Copenhagen interpretation" of quantum mechanics of which one of the main planks was Bohr's theory of "complementarity".
www.sunderland.ac.uk /~hs0bcl/h_nb.htm   (723 words)

  
 Niels Bohr
Niels Bohr was born on 7th October 1885 in Copenhagen as the son of the physiologist Christian Bohr
Niels Bohr gained thereby the view that nature, for her complete description, allows the use of mutually exclusive but on the other hand mutually complementary visions.
Niels Bohr nahm aktiv an der Gründung des Europäischen Zentrums für Kernforschung, CERN, in Genf teil.
www.ethbib.ethz.ch /exhibit/pauli/bohr.html   (1242 words)

  
 A Science Odyssey: People and Discoveries: Niels Bohr   (Site not responding. Last check: 2007-10-21)
Niels Bohr was born and educated in Copenhagen, Denmark.
Bohr's personal warmth, good humor ("Never express yourself more clearly than you can think," he once said), and hospitality combined with world events to make Copenhagen a refuge for many of the century's greatest physicists.
Bohr went on to organize the Atoms for Peace Conference in Geneva in 1955.
www.pbs.org /wgbh/aso/databank/entries/bpbohr.html   (705 words)

  
 Bohr, Aage Niels (1922-) -- from Eric Weisstein's World of Scientific Biography
Danish physicist born in Copenhagen on June 19, 1922 as the fourth son of Margarethe and Niels Bohr.
Working with Mottelson in Copenhagen, Aage Bohr summarized current knowledge of nuclear structure in a monograph, of which the first volume, Single-Particle Motion, appeared in 1969, and the second volume, Nuclear Deformations, in 1975.
Their efforts on this project and their collaboration on nuclear theory led them both to receive the 1975 Nobel Prize in Physics, which they shared with Rainwater, for research on the quantum mechanical description of nucleons orbiting inside a wobbly rotating droplet.
scienceworld.wolfram.com /biography/BohrAage.html   (285 words)

  
 Bohr, Niels (1885-1962) -- from Eric Weisstein's World of Scientific Biography
Bohr stated the Correspondence Principle, which states that quantum mechanical formulas must reduce to the classical results in the limit of large quantum number.
Niels Bohr: His Life and Work as Seen by His Friends and Colleagues.
Whitaker, A. Einstein, Bohr, and the Quantum Dilemma.
scienceworld.wolfram.com /biography/BohrNiels.html   (188 words)

  
 Niels Bohr
Bohr worked with Ernest Rutherford in Manchester (1912-16) where he developed a model of atomic structure and helped to establish the validity of quantum theory.
Meitner explained her theory of uranium fission and argued that by splitting the atom it was possible to use a few pounds of uranium to create the explosive and destructive power of many thousands of pounds of dynamite.
Bohr continued with his research after Denmark was invaded by the German Army.
www.spartacus.schoolnet.co.uk /USAbohr.htm   (531 words)

  
 The Bohr Model
The Bohr Model is probably familar as the "planetary model" of the atom illustrated in the adjacent figure that, for example, is used as a symbol for atomic energy (a bit of a misnomer, since the energy in "atomic energy" is actually the energy of the nucleus, rather than the entire atom).
In the Bohr Model the neutrons and protons (symbolized by red and blue balls in the adjacent image) occupy a dense central region called the nucleus, and the electrons orbit the nucleus much like planets orbiting the Sun (but the orbits are not confined to a plane as is approximately true in the Solar System).
This similarity between a planetary model and the Bohr Model of the atom ultimately arises because the attractive gravitational force in a solar system and the attractive Coulomb (electrical) force between the positively charged nucleus and the negatively charged electrons in an atom are mathematically of the same form.
csep10.phys.utk.edu /astr162/lect/light/bohr.html   (711 words)

  
 AIP Center for History of Physics Niels Bohr Library   (Site not responding. Last check: 2007-10-21)
The Niels Bohr Library's resources consist of books, journals, archives and manuscripts, photographs, interview tapes and transcripts, and other materials documenting the history of nineteenth and twentieth century physics and allied fields (such as astronomy, geophysics, and optics) in America and throughout the world.
Some major collections of personal and professional papers in the Niels Bohr Library's archives are those of Samuel A. Goudsmit, atomic scientist and editor of the Physical Review; Lew Kowarski, a major figure in European nuclear energy development; William Meggers, noted National Bureau of Standards spectroscopist; and the renowned theorist John Van Vleck.
Click here for archival resources near D.C. The Niels Bohr Library was created through the generosity of Dannie Heineman, and is sustained by the general funds of the American Institute of Physics and by tax-deductible donations to the Friends of the Center for History of Physics and its Endowment Fund.
www.aip.org /history/nblbro.htm   (1725 words)

  
 Niels Bohr Biography
Niles Bohr received the Nobel Prize in physics in 1922 for the quantum mechanical model of the atom that he had developed a decade earlier, the most significant step forward in scientific understanding of atomic structure since English physicist John Dalton first proposed the modern atomic theory in 1803.
Bohr founded the Institute for Theoretical Physics at the University of Copenhagen in 1920, an Institute later renamed for him.
It was an essential stopover for all young physicists who made the tour of Europe's center of theoretical physics in the mid-twentieth century.
www.bookrags.com /biography/niels-bohr-wop   (184 words)

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