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  • Theory Of Nuclear Fission
    887 words
    1930 Schr " odin ger views electrons as continuous clouds and introduces 'wave mechanics' as a mathematical model of the atom. 1931 Albert Einstein urges all scientists to refuse military work. Harold C. Urey of the United States and associates discover deuterium (heavy hydrogen) which is present (0.014%) in all natural hydrogen compounds including water. John D. Cockcroft of Great Britain develops high-voltage apparatus for atomic transmutation. 1932 James Chadwick proves the existence of neutr...
  • British Progress Towards An Atomic Bomb
    449 words
    Manhattan Project II. The Race for the Bomb The theoretical possibility that an explosion could be brought about by atomic fission became known in 1939, the year that war broke out in Europe. Scientists discovered then that uranium atoms can fission when struck by neutrons to split other atoms in a chain reaction, releasing large amounts of energy. Two Hungarian physicists who had recently emigrated to the United States, Leo Szilard and Eugene Wigner, alerted the US government to the possibility...
  • Neutrons Back Into The Fissionable Material
    1,119 words
    also called ATOM BOMB, weapon with great explosive power that results from the sudden release of energy upon the splitting, or fission, of the nuclei of such heavy elements as plutonium or uranium. When a neutron strikes the nucleus of an atom of the isotopes uranium 235 or plutonium-239, it causes that nucleus to split into two fragments, each of which is a nucleus with about half the protons and neutrons of the original nucleus. In the process of splitting, a great amount of thermal energy, as...
  • Nucleus Of The Plutonium Atom
    916 words
    Plutonium Plutonium is a radioactive metallic element. Although it is occasionally found in nature, mostly all of our plutonium is produced artificially in a lab. The official chemical symbol for plutonium is Pu, coming from its first and third letters. Its atomic number is ninety-four. Plutonium is able to maintain its solid state until very high temperatures, melting at six hundred and forty degrees Celsius, and boiling at three thousand four hundred and sixty degrees. The density of Plutonium...
  • First Atomic Bomb
    382 words
    TIMELINE of the Atomic Bomb. 1942 May - Heisenberg and Do pel observe the first multiplication of neutrons. December 2 - First nuclear chain reaction at Chicago's Stagg Field by Fermi. 1943 March 15 - Oppenheimer moves the bomb development to Los Alamos. 1944 August 26 - Bohr presents his memorandum on intentional control of nuclear weapons to Roosevelt. 1945 January 20 - First Uranium-235 separated at Oak Ridge. July 16 - U.S. explodes first atomic bomb, the Trinity test, at Alamogordo. August ...
  • Study Of Atomic Matter
    519 words
    subject = physics title = Atomic Physics papers = Please put your paper here. ATOMIC PHYSICS Atomic Physics- is the study of atomic matter. History of the atom Dalton John Dalton was a chemist who was famous for his atomic theory. He discovered that air was a mixture, not a compound. He also discovered that the solubility of a gas depends on the weight of its atoms. He published the law of partial pressures, known as D Thomson Sir Joseph John Thomson was a British physicist who won the 1906 Nobe...

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