Wednesday, June 10, 2009

NIELS BOHR

Pig, frog, trenggiling, man, they all have fathers, official or unofficial. So also the theory of atomic structure have no father. He was Niels Henrik David Bohr was born the year 1885 in Copenhagen. In 1911 he achieve physics doctorate from the University of Copenhagen. Not long after he went to Cambridge, UK. There he studied under the care J.J. Thompson, famous scientists who found electrons. Only in a few months after that Bohr moved to Manchester, to study at the Ernest Rutherford some years earlier found Nucleus (the core) atom. Rutherford is asserted that this (with different opinions before) that the atom is generally empty, with a heavy punch in the middle and the electrons at the outside. Not long after Bohr theory soon develop its own new and radical about the structure of atoms.

Bohr paper that is like the history of swing "On the Constitution of atoms and Molecules," Philosophical Magazine published in the year 1933.

Bohr introduced the atomic theory as a kind of miniature planetary orbit the sun, with the electron-electron orbitnya girth around the core, but with a very important difference: when the laws of classical physics says about the rotation in the orbit of all sizes, Bohr proved that the electron-electron in a atom can only rotate in orbitnya in a specific size. Sentence or in other formulations: the electron-electron orbit is on the main level of energy (skin) without a shed or absorb energy. Electrons can move from layer to layer in the outside if the energy absorbed. Conversely, electrons will move from the outside layer to layer in more with the energy emit.

Bohr introduced the theory of radical difference between the idea theory of classical physics. Some scientists of imagination (such as Einstein) immediately make paper Bohr praised as a "masterpiece," a big job; although so many other scientists initially ignore this new theory of truth. Experiment is the most critical is the ability to explain the Bohr theory of hydrogen atom spectrum. Has long been known that hydrogen gas when heated at high levels of heat, light akan issue. However, the light is not cover all colors, but only in light of the particular frequency. Value of the theory of Bohr atom departs from the hypothesis is simple but able to explain the provisions of imposing on the wave length of the exact line of all Spectral (color) which is issued by hydrogen. Furthermore, the Bohr theory of the Spectral estimate of additional, not previously seen at the time, but then ascertained by the tester. In addition, the Bohr theory of atomic structure overlooking the obvious explanation for the atoms have what size as such. Ditilik of all ensure that this incident, immediately accepted the theory of Bohr, and Bohr in the year 1922 can, Nobel prize for physics field.

Year of Physics 1920 the institution was established theoretical Bohr in Copenhagen and a Director. Under pirnpinannya quickly attract young scientists-a brilliant scientist, and soon became the center of scientific investigation of the world.

But while the Bohr theory of atomic structure of the difficulties. Terpokok problem is that the Bohr theory, even with a perfect difficulty explaining the future of atom (eg hydrogen) that have one electron, not with the exact estimate spektra atom-atom from another. Some scientists, terpukau by extraordinary success in the Bohr theory explain the hydrogen atom, with the hope that the way to refine a few Bohr theory, they can also explain the more spektra atomic weight. Bohr was one of his own first realize that the small improvement will not help, because it is the radical renovation is required. But, however he geniusnya mobilize all the intellect, yet he was not able to solve.

Solution eventually found by Werner Heisenberg and others, starting from 1925. It is interesting to note here, that Heisenberg - and generally scientists who develop new theory - to study in Copenhagen, with no more suspicion has taken a big benefit from the discussions with Bohr, and each other. Bohr own rushing towards new ideas and help develop it. He makes important contributions to the theory, and sodomy disuksi-discussion and posts, he helped raise more systematically.

1930-an shows more attention to the problem of the basic structure of the atom. He developed a model of important "drops down" the basic atom. He also put the theory on "a combination of the basic" atom in the reaction to be solved. Moreover, is the Bohr who quickly said that the uranium isotope involved in nuclear division is U235. This statement has important significance in the development of the next atom bomb.

In 1940 German troops occupied Denmark. This place themselves in danger Bohr, in part because he has anti-Nazi attitude is widespread, in part because his mother a Jew. Year 1943 Bohr fled from Denmark so that the occupation, to Sweden. He also helped a large number of Danish Jews escape to avoid death in the gas room Hitler. Bohr fled from Swedish to English and from there cross over to the United States. In this country, takes place during the war, Bohr help make atomic bombs,

After the war, Bohr returned to Denmark and village institutions tend to drift rohnya year 1 `562. In the years after Bohr war effort - albeit unsuccessful - to encourage the international order to supervise the use of atomic energy.

Bohr kawin 1912, around the time he was doing great work in the field of science. He has five children, one named Aage Bohr, won the Nobel prize for physics in the field in 1975. Bohr is the most groove scientists in the world, not merely observe the knowledge of genius, but also personality and character and a sense of depth kemanusiaannya.

Although the original Bohr theory of atomic structure of the past fifty years past, he still is one of the great figures in 20th century. There are several reasons why so. First, some of the things important theory is still considered correct. For example, the idea that the atom can have only on the level of energy that is careful not an integral part of all theories atomic structure of the next. Other things, a description of the Bohr atom has a big meaning to find something for themselves, although modern scholars do not consider it literally true. The most important of all, perhaps, is that Bohr's ideas is the driving force for the "quantum theory." Although some ideas have expired, but the clear-historical theory is a theory already proven point of departure of the modern atomic theory and the development of the next field of quantum mechanics.

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