Learn More About This
Directory
This directory sponsored by SIQL, a Spider Makers company...
1. Niels Henrik David Bohr
- www.nobel-winners.com
- Niels Henrik David Bohr.
- Niels Henrik David Bohr.
- The Danish physicist Niels Henrik David Bohr is known primarily for his pioneering work in the field of atomic theory. 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. After completing his dissertation on the electron theory of metals in 1911, Bohr went briefly to Cambridge and then on to Manchester, England. ...
- With the problem of atomic structure in mind, Bohr worked in Manchester relentlessly from May through July of 1912 and succeeded in obtaining a formula correctly describing the absorption of helium nuclei by other atomic nuclei. ...
- In the autumn of 1912, Bohr returned to Copenhagen to become an assistant at the university and began a happy marriage that produced six sons. ... 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. ... At the age of 28, Bohr had reached the summit of his career with his theory of the atom.
- 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. ...
- In 1939, one year before the German invasion of Denmark, Bohr became president of the Royal Danish Academy of Sciences and Letters and began to develop a theory of nuclear fission. In 1943 the Germans planned to arrest him and make him work in Germany on an atomic project, but Bohr fled with his family and spent the war years in the United States, where he participated in the British-American atomic bomb project at Los Alamos.
- After the war Bohr returned to Denmark and periodically expressed his strong feelings regarding the duties imposed upon humanity by its possession of atomic energy. ...
2. Aage Niels Bohr
- www.nobel-winners.com
- Aage Niels Bohr.
- Aage Niels Bohr.
- Bohr was educated at the University of Copenhagen, where he received his doctorate in 1954. During the 1940s he worked as assistant to his father, Niels Bohr (1922 Nobel physics laureate), on the development of the atomic bomb at Los Alamos, N. ... From 1946 he was associated with the Niels Bohr Institute of Theoretical Physics, founded in Copenhagen by his father, whom he succeeded as director from 1963 to 1970. ... Mottelson in the early 1950s, Bohr discovered that the motion of subatomic particles can distort the shape of the nucleus, thus challenging the widely accepted theory that all nuclei are perfectly spherical. ... Bohr's writings include Rotational States of Atomic Nuclei (1954) and Nuclear Structure, 2 vol. ...
3. The Bohr Model
- csep10.phys.utk.edu
- The Bohr.
- The most important properties of atomic and molecular structure may be exemplified using a simplified picture of an atom that is called the Bohr Model. This model was proposed by Niels Bohr in 1915; it is not completely correct, but it has many features that are approximately correct and it is sufficient for much of our discussion. The correct theory of the atom is called quantum mechanics; the Bohr Model is an approximation to quantum mechanics that has the virtue of being much simpler. ...
- The Bohr atom .
- 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. ...
- The basic feature of quantum mechanics that is incorporated in the Bohr Model and that is completely different from the analogous planetary model is that the energy of the particles in the Bohr atom is restricted to certain discrete values. ...
4. The Bohr Model of the Atom
- www.ucdsb.on.ca
- The Bohr Model of the Atom The problem with finding out that electrons where capable of existing only at certain energy levels was coming up with a model to explain these levels. In 1913 Neils Bohr (1885-1962), a Danish physicist, proposed a theoretical model for the hydrogen atom. ... In his model, Bohr imagined the electron to move around the nucleus following fixed paths, or orbits, much as a planet moves around the sun. ... 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. It also contained an integer, n, that Bohr called a quantum number. ...
- Bohr's Atomic Model .
- Bohr found that the electron had the least energy when n = 1. which corresponds to the first Bohr orbit. ...
- Bohr's model of the atom was both a success and a failure. ...
5. Chapter Nine The Bohr Model of the Atom
- www.chem.ufl.edu
- The Bohr Model of the Atom .
- Bohr knew that light was absorbed and emitted by atoms. ... What Bohr didn't know was why atoms are stable. ...
- Bohr's answers to these questions were one of the first triumphs of the new Quantum Theory. ...
- Bohr used the ideas and principles from Quantum mechanics to suggest a model of the hydrogen atom. ...
- Bohr's model explained the emission spectra of hydrogen. ... The Bohr view of emission and energy is shown schematically in the figure below. ...
- Another view of the Bohr model can be seen in the following figure, which represents the interaction between an electron and the nucleus. In the Bohr model, the electron can only "stick" at certain allowed values of r. ...
- Bohr's model was a great success for Hydrogen. ... The Bohr model also use a mixture of ideas from the classical (old) model of physics with ideas from quantum mechanics. ...
- The failures of the Bohr model led to the New Quantum Mechanics, which remains our dominant world view. ...
6. Bohr, Niels (1885-1962) -- from Eric Weisstein's World of Scientific Biography
- scienceworld.wolfram.com
- Bohr, Niels (1885-1962).
- Bohr stated the Correspondence Principle, which states that quantum mechanical formulas must reduce to the classical results in the limit of large quantum number. ...
- Bohr (Aage), Bohr (Christian), Bohr (Harald) .
- Harmony and Unity: The Life of Niels Bohr. ...
- Niels Bohr's Philosophy of Physics. ...
- Niels Bohr's Times: In Physics, Philosophy, and Polity. ...
- Niels Bohr and the Development of Physics: Essays on the Occasion of his 70th Birthday. ...
- Atoms, Metaphors, and Paradoxes: Niels Bohr and the Construction of a New Physics. ...
- Niels Bohr: His Life and Work as Seen by His Friends and Colleagues. ...
- Einstein, Bohr, and the Quantum Dilemma. ...
7. Copenhagen . Niels Bohr | PBS
- www.pbs.org
- Niels Bohr, 1925.
- Niels Bohr was one of the most influential scientists of the 20th Century and a major force in the field of quantum physics. ... See the animation of "The Bohr Atom", below, right. Bohr recognized that Ernest Rutherford's model of the atom, in which electrons emitted radiation continuously, was unstable according to the laws of classical physics. 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.
- Bohr's father was a well-known Danish physiologist, his mother came from a wealthy family of Jewish bankers. Bohr earned his Ph. ...
- Margrethe Norlund and Niels Bohr engaged, 1911.
- In 1909 when his brother Harald left to pursue his own academic endeavors, Bohr hired Margrethe Norlund to type his numerous papers. ...
- In 1921 Bohr was named director of the new Institute for Theoretical Physics in Copenhagen, which soon became a requisite destination for atomic physicists from around the world. During a lecture series in Gottingen, Germany, Bohr befriended the young Werner Heisenberg, see video above initiating their famous collaboration. In 1933, after the Nazis authorized German universities to fire staff on the grounds of politics and race, Bohr enabled young refugee physicists to come to his institute.
- Niels Bohr, 1962.
- After Germany occupied Denmark, Bohr fled with his family to Sweden, and then to the United States where he helped develop the atomic bomb. ...
- The book included an excerpted letter from Werner Heisenberg detailing his recollection of his meeting with Bohr in Copenhagen in 1941. Heisenberg's recasting of the events so angered Bohr that he drafted a letter to Heisenberg renouncing his version of the meeting. ... But in February of 2002, in order to clarify Bohr's position about the meeting, the Bohr family posted on the internet the draft letter and other documents pertaining to the 1941 meeting.
8. Daily Celebrations ~ Niels Bohr, A Profound Truth ~ October 7 ~ Ideas to motivate, educate, and inspire
- www.dailycelebrations.com
- October 7 ~ A Profound Truth Niels Bohr Gentle Genius .
- " ~ Niels Bohr.
- One of the leading figures of modern science, Danish physicist Niels Henrik David Bohr (1885-1962) was born on this day, studied at Copenhagen University, and was a professor there.
- In 1912, Bohr moved to England and worked with the Nobel Prize-winning scientist Ernest Rutherford to better understand the structure of the atom. ...
- "When it comes to atoms," Bohr said, "language can be used only as in poetry. ...
- Bohr is well-known for his friendly debates with Albert Einstein about quantum theory. "Not often in life has a man given me so much happiness by his mere presence as you have done," Einstein wrote to Bohr. ...
- Bohr won the 1922 Nobel Prize in Physics for his theory of atom structure and was involved in the research at Los Alamos, New Mexico in 1945. ...
9. 1960erne.dk: Niels Bohr
- www.1960erne.dk
- • Niels Bohr.
- Danmark - Niels Bohr .
- Niels Bohr blev født i København den 7. ... Faderen var den internationalt anerkendte fysiolog Christian Bohr. ...
- Efter afsluttet studentereksamen i 1903 påbegyndte Niels Bohr fysikstudiet ved Københavns Universitet. ...
- I 1911 rejste Niels Bohr til England. ...
- Denne kom til den videnskabelige verdens kendskab, efter Bohr i 1913 fik offentliggjort tre afhandlinger i tidsskriftet Philosopical Magazine.
- I de efterfølgende år udbyggede Bohr atommodellen yderligere. ...
- Den ultimative hæder kom i 1922, hvor Niels Bohr i en alder af 37 år - som den hidtil yngste - tildeltes Nobels fysikpris. ...
- Niels Bohr Instituttet.
- I 1916 blev Niels Bohr ansat i et professorat ved Københavns Universitet. ...
- I daglig tale blev den imidlertid slet og ret kaldt for Niels Bohr Instituttet, hvilket den da også officielt blev omdøbt til i 1965.
- Bohr havde altid drømt om internationalt samarbejde indenfor videnskaben. ... Mange udenlandske forskere besøgte København, hvor de både drev selvstændig forskning og udvekslede synspunkter med Niels Bohr. ...
- Mennesket Niels Bohr.
- I 1912 indgik Niels Bohr ægteskab med Margrethe Nørlund. ...
10. Chapter 4: Niels Bohr and the Quantum Atom
- www.faqs.org
- Chapter 4: Niels Bohr and the Quantum Atom .
- Niels Bohr happened to matter. Bohr was a Danish physicist whose parents were both scientists. ... Niels Bohr .
- One can see just by looking at Niels Bohr's early academic life (though there are many other indicators) that the 'atomic theory' of matter -- that is to say that matter is made up of tiny atoms -- had gone from being scientifically marginalised to being at the heart of physics in a very short time. Bohr's doctoral thesis was concerned with the inadequacy of classical (that is to say, Newtonian) physics for describing the behaviour of matter at the atomic level. ...
- Bohr's Explanation.
- Niels Bohr quickly seized upon this problem and used it to propose a quantised description of the atom. ...
- Bohr proposed that while circling the nucleus of the atom, electrons could only occupy certain discrete orbits, that is to say energy levels 2 . Bohr used Max Planck's equations describing quanta of radiation to determine what these discrete orbits would have to be. ...
- Further, Bohr said electrons give or take energy only when they change their energy levels. ...
- Furthermore, Bohr also said that an electron which is not in its native energy level (in other words, which has been excited to a higher energy level) always has to fall back to its original, stable level. ...
- Bohr interpreted the lines in the spectra of gases as formed by the transitions of electrons to and from various energy-levels. ... Bohr's formulae agreed excellently with observed line positions. ... 4-4: Bohr's Explanation of Line Spectra 4 .
- This description in which electrons can only occupy certain orbits is called the shell model of the atom, because Bohr described the possible orbits of the electrons as orbitals or shells. ...
11. Bohr's Atom
- www.colorado.edu
- Bohr's Atom.
- To explain the spectral line puzzle, Bohr came up with a radical model of the atom which had electrons orbiting around a nucleus. ...
- Yes, but in order to explain the "signature colors," Bohr came up with an extraordinary rule the electrons had to follow: Electrons can only be in "special" orbits. ...
- Now you can see why the Bohr model was considered so radical! It said that energy could only change in little jumps. ...
12. Niels Bohr Winner of the 1922 Nobel Prize in Physics
- www.almaz.com
- NIELS BOHR .
- Niels Bohr Institute and the Niels Bohr Archive .
- His son and fellow laureate, Aage Bohr .
- The Niels Bohr Library resources .
- Short biography of Bohr .
- Quantum Reality - An article about the Einstein-Bohr Debate on the interprtaton of quantum mechanics .
- about Niels Bohr (submitted by Shrirang Bhate) .
- Celebration of Niels Bohr .
- People and Discoveries: Niels Bohr (submitted by Chinnappan Baskar) .
- Science Jokes: Niels Bohr (submitted by Chinnappan Baskar) .
- Niels Bohr – Nobel Lecture (submitted by Chinnappan Baskar) .
- Aage Niels Bohr – Autobiography (son of Niels Bohr and 1975 Nobel Laureate) (submitted by Chinnappan Baskar) .
- Niels Bohr Archive (submitted by Hendry Izaac Elim) .
- About Niels Bohr (submitted by Dr. ...
- Bohr, Niels (1885-1962) (submitted by Davis) .
- Science Jokes:Niels Bohr (submitted by Jackson) .
Other related topics:
Do you have a great site about Bohr? Is
your Bohr site listed here?
Would you like a prefered placement of your site in this directory?
It's easy! First place, the HTML from the box below on your page that
you would like listed in this directory.
Then use our link submission request with
your name, your contact information, and the URL of your site that has
a link to this directory. After we
verify your link to us, we'll make sure your site stays in our directory,
and we'll give it prefered placement here also.
Here is how to make a simple text link to us. Just copy the code in this
box to your website:
We can also develop a custom Guide To The Internet for your site. Please
request your own
custom Guide To The Internet.
This custom Guide To The Internet produced by
Siql. Visit us today, and find out how to get your own
custom guide to the Internet, and how to get your site
listed in our guides.
Copyright 1995-2004 by Siql. All
Rights Reserved.