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Topic: Niels Henrik David Bohr


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  AllRefer.com - Niels Henrik David Bohr (Physics, Biography) - Encyclopedia
Niels Henrik David Bohr[nEls han´ rEk dA´vEth bOr] Pronunciation Key, 1885–1962, Danish physicist, one of the foremost scientists of modern physics.
Bohr provided the solution to this problem in 1913, when he postulated that electrons move around the nucleus of the atom in restricted orbits and explained the manner in which the atom absorbs and emits energy.
Bohr was a leading figure in the continuing development of the quantum theory over the next twenty years.
reference.allrefer.com /encyclopedia/B/Bohr-Nie.html   (495 words)

  
 Niels Bohr - Wikipedia, the free encyclopedia
His brother was Harald Bohr, a mathematician and Olympic soccer player who played in the Danish national team; Niels Bohr was a passionate soccer player as well, but, contrary to what is claimed sometimes, never played in the national team.
Based on 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.
en.wikipedia.org /wiki/Niels_Bohr   (1138 words)

  
 Niels Bohr: Tutte le informazioni su Niels Bohr su Encyclopedia.it   (Site not responding. Last check: 2007-10-22)
Niels Henrik David Bohr (7 Ottobre 1885 - 18 Novembre 1962), fisico danese, che diede contributi essenziali nella comprensione della struttura atomica e nella meccanica quantistica.
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.
www.encyclopedia.it /n/ni/niels_bohr.html   (518 words)

  
 Niels Bohr - Biography
Niels Henrik David Bohr was born in Copenhagen on October 7, 1885, as the son of Christian Bohr, Professor of Physiology at Copenhagen University, and his wife Ellen, née Adler.
Bohr's subsequent studies, however, became more and more theoretical in character, his doctor's disputation being a purely theoretical piece of work on the explanation of the properties of the metals with the aid of the electron theory, which remains to this day a classic on the subject.
Niels Bohr was President of the Royal Danish Academy of Sciences, of the Danish Cancer Committee, and Chairman of the Danish Atomic Energy Commission.
nobelprize.org /physics/laureates/1922/bohr-bio.html   (1164 words)

  
 Bohr, Niels
One of the foremost scientists of the 20th century, Niels Henrik David Bohr was the first to apply the quantum theory, which restricts the energy of a system to certain discrete values, to the problem of atomic and molecular structure.
Bohr was born in Copenhagen on Oct. 7, 1885.
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.britannica.com /nobel/macro/5000_79.html   (2274 words)

  
 Niels Henrik David Bohr   (Site not responding. Last check: 2007-10-22)
Niels Bohr was born on October 7, 1885, in Copenhagen, Denmark.
Bohr used Rutherford's findings that an atom is made up of a positively charged nucleus surrounded by negatively charged electrons and proposed that electrons travel in orbits, with the outer orbits holding more electrons than the inner ones.
Bohr is best known for his investigations of the atomic structure and also for his work on radiation, for which he won the Nobel Prize in 1922.
www.ceemast.csupomona.edu:16080 /nova/bohr.html   (841 words)

  
 SJSU Virtual Museum   (Site not responding. Last check: 2007-10-22)
Niels Bohr was awarded a Nobel Prize for physics in 1922 for his work on determining the structure of the atom.
Bohr's work combined the quantum theory with the Planck constant (the ratio between quantum size and the frequency of radiation from the atom).
Niels Bohr died in Holland on November 18, 1962.
www.sjsu.edu /depts/Museum/boh.html   (258 words)

  
 [No title]   (Site not responding. Last check: 2007-10-22)
Bohr was born in Copenhagen and was educated at the University of Copenhagen at the time when Max Planck had just begun the development of quantum mechanics.
Especially astonishing was that Bohr, in his explanation of atomic structure, departed from classical mechanics and made use of Planck's constant and the quantum theory.
In 1916, Bohr was appointed professor of theoretical physics at the University of Copenhagen, and in 1922 he was awarded the Nobel Prize for physics.
www.phy.hr /~dpaar/fizicari/xbohr.html   (528 words)

  
 Bohr_Niels
Bohr was taught mathematics at university by Thorvald Thiele.
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-groups.dcs.st-and.ac.uk /~history/Mathematicians/Bohr_Niels.html   (2841 words)

  
 ipedia.com: Niels Bohr Article   (Site not responding. Last check: 2007-10-22)
In 1916, Bohr became a professor at the University of Copenhagen, and director of the newly constructed "Institute of Theoretical Physics" in 1920.
Bohr was largely affected by the philosophy of Søren Kierkegaard of sharp sudden "quality" changes and rejection of the continuous changing.
Niels Bohr and his wife Margrethe had several children, one of whom, Aage Niels Bohr, also became a very successful physicist: like his father, he won a Nobel prize.
www.ipedia.com /niels_bohr.html   (804 words)

  
 MSN Encarta - Niels Bohr
Bohr was born in Copenhagen, the son of a physiology professor, and was educated at the University of Copenhagen, where he earned his doctorate in 1911.
Bohr’s theory of atomic structure (see Quantum Theory), for which he received the Nobel Prize in physics in 1922, was published in papers between 1913 and 1915.
In 1916 Bohr returned to the University of Copenhagen as a professor of physics, and in 1920 he was made director of the university’s newly formed Institute for Theoretical Physics.
encarta.msn.com /encnet/refpages/RefArticle.aspx?refid=761576813   (538 words)

  
 The Bohr Model of the Atom   (Site not responding. Last check: 2007-10-22)
In 1913 Neils Bohr (1885-1962), a Danish physicist, proposed a theoretical model for the hydrogen atom.
The equation Bohr derived for the energy of the electron included a number of physical constants such as the mass of the electron, its charge, and Planck's constant.
Since the energy of the electron in a given orbit is fixed, a drop from one particular orbit to another, say from n=2 to n=1, always releases the same amount of energy, and the frequency of light emitted because of this change in energy is always precisely the same.
www.ucdsb.on.ca /tiss/stretton/chem1/elecon5.html   (382 words)

  
 Bohr   (Site not responding. Last check: 2007-10-22)
Niels Henrik David Bohr, a Danish physicist and Nobel laureate, made basic contributions to nuclear physics and the understanding of atomic structure.
Bohr's theory of atomic structure, for which he received the Nobel Prize in physics in 1922, was published in papers between 1913 and 1915.
In 1916 Bohr went to the University of Copenhagen as a professor of physics, and in 1920 he was made director of the university's newly formed Institute for Theoretical Physics.
www.newlisbon.k12.wi.us /physicists/bohr.html   (413 words)

  
 Niels Henrik David Bohr - Viquipèdia
Niels Henrik David Bohr fou un físic danès Copenhague, 1885-1962.
L'atom de Bohr, model proposat en 1913, aplica la teoria de Max Planck al model planetari elaborat en 1911 per Rutherford, que permet interpretar amb rigor i precisió l'espectre de l'àtom d'hidrogen.
Les series espectrals observades són interpretades per bohr com a salts de nivell; la freqüència de la radiació depèn del salt i, consegüentment, l'energia emesa serà més gran en la mesura que el salt sigui més gran.
ca.wikipedia.org /wiki/Niels_Bohr   (445 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)

  
 Glossary of People: Bo
It was here that Bohr worked on the theoretical implications of Rutherford's nuclear model of the atom and he was among the first to see the importance of the number of electrons in an atom's structure in determining the physical and chemical properties of an element.
Bohr was the first to see that a stable atomic structure was possible if energy levels were inherently restricted to discrete levels, a possibility made conceiveable by Max Planck's discovery of the discrete properties of radiation spectra.
Bohr returned to Copenhagen in 1912, and was appointed to a professorship from which position he led research into the fundamental quantum physics for the rest of his life, with many of the great physicists of the period, including Werner Heisenberg coming to work in Copenhagen.
www.marxists.org /glossary/people/b/o.htm   (1895 words)

  
 Niels Henrik David Bohr
Two years later Niels was born on his mother's 25th birthday in the same stately home, Ellen again having returned to her mother's house for the birth of her child.
Bohr is best known for the investigations of atomic structure referred to above and also for work on radiation, which won him the 1922 Nobel Prize for physics.
Bohr, although he had been christened in the Christian Church, had Jewish origins on his mother's side and so, when the Nazis occupied Denmark in 1940, his life became exceeding difficult.
www.jewishvirtuallibrary.org /jsource/biography/Bohr.html   (2671 words)

  
 A Science Odyssey: People and Discoveries: Niels Bohr
Niels Bohr was born and educated in Copenhagen, Denmark.
Bohr remained director of the institute for the rest of his life, except for his absence during World War II.
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)

  
 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: 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   (Site not responding. Last check: 2007-10-22)
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".
orac.sunderland.ac.uk /~hs0bcl/h_nb.htm   (723 words)

  
 Niels Bohr | Physicist
Bohr also described the way atoms emit radiation by suggesting that when an electron jumps from an outer orbit to an inner one, that it emits light.
Bohr became a professor of physics at the University of Copenhagen in 1916.
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)

  
 Free Essays - Niels Henrik David Bohr
Niels Bohr studied at the University of Copenhagen which he entered in 1903.
Bohr returned to Copenhagen during 1912 and continued to develop his new theory of the atom completing the work in 1913.
Bohr was of Jewish origins and, when the Nazis occupied Denmark his life became exceeding difficult.
www.freeessays.tv /c355.htm   (718 words)

  
 Quantum Mechanics, 1925-1927: Triumph of the Copenhagen Interpretation
Bohr, who had been on a skiing vacation, returned to the institute to find Heisenberg's paper already in draft.
Forwarding the paper to Einstein at Heisenberg's request, Bohr complained to Einstein that Heisenberg's approach was too narrow and his gamma-ray microscope was flawed, although the result was correct.
For Bohr, the uncertainty relations arose not merely from the quantum equations and the use of particles and discontinuity.
www.aip.org /history/heisenberg/p09.htm   (922 words)

  
 Quantum Physics: Niels Bohr: Explaining Bohr's Model of the Atom. Niels (Neils) Bohr Biography, Quotes, Pictures
Niels Bohr brainwashed a whole generation of physicists into believing that the problem (of the interpretation of quantum mechanics) had been solved fifty years ago.
Niels Bohr profoundly influenced the evolution of Modern Physics (Quantum Theory), and I think history will show that his influence was very detrimental.
Niels Henrik David Bohr (October 7, 1885 – November 18, 1962) was a Danish physicist who made essential contributions to understanding atomic structure and quantum mechanics.
www.spaceandmotion.com /Physics-Niels-Bohr.htm   (6710 words)

  
 Biografía de Niels Henrik David Bohr   (Site not responding. Last check: 2007-10-22)
Bohr nunca hablaba más alto que un susurro.
Bohr permaneció en Manchester hasta 1916, año en que volvió a Copenhague al ser nombrado profesor de física teórica en la universidad de dicha ciudad.
Bohr fue galardonado, en 1922, con el Premio Nobel de Física por sus trabajos sobre la estructura atómica y la radiación.
www.astrocosmo.cl /biografi/b-n_bohr.htm   (1036 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)

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