Sunday, June 26, 2011

Sir Ernest Rutherford's life


Sir Ernest RUTHERFORD was born on the 30th day of August 1871 in Spring Grove, New Zealand. He was educated at Canterbury College in Christchurch (from 1890 to 1894). He is a British Physicist.  He is once a professor of physics at McGill University (from 1898-1907) which was at that time under the directorship of Sir Joseph John Thomson, the leading authority on electromagnetic phenomena. And he also worked as a Director of the Cavendish laboratory. He died in London on the 19th day of October 1937 because of complications of Surgery. He was buried in Westminster Abbey.
Theory of successive transformations with Frederick Soddy, abolishing idea of performance of atoms.
Frederick Soddy arrived at McGill in 1900 from Oxford, and he collaborated with Rutherford in creating the "disintegration theory" of radioactivity which regards radioactive phenomena as atomic  processes. In 1902, he formulated the transformation theory of radioactivity with Frederick Soddy. This, they said, was a case of artificial disintegration of an element. Unstable, or radioactive, atoms disintegrated spontaneously; but here a stable nucleus was disrupted by the alpha particle, and a proton was one of the pieces broken off. They explained that radioactivity is due to the transmutation of elements, now known to involve nuclear reactions.
Identification of Alpha, Beta radiation
Rutherford discovered and named alpha and beta decay and coined the terms alpha, beta, and gamma rays. He demonstrated radioactivity was the spontaneous disintegration of atoms and was the first person to artificially disintegrate an element. He identified alpha particles as helium nuclei.
Nuclear theory of the atom
Ernest Rutherford publishes his atomic theory describing the atom as having a central positive nucleus surrounded by negative orbiting electrons. Ernest Rutherford suggested that most of the mass of the atom was contained in the small nucleus, and that the rest of the atom was mostly empty space. Rutherford came to this conclusion following the results of his famous gold foil experiment. This experiment involved the firing of radioactive particles through minutely thin metal foils (notably gold) and detecting them using screens coated with zinc sulfide (a scintillator). Rutherford found that although the vast majority of particles passed straight through the foil approximately 1 in 8000 were deflected leading him to his theory that most of the atom was made up of 'empty space'.
First observation of artificial transmutation, in alpha particle bombardment of nitrogen
After the war, already in 1919, first artificial transmutation carries out his. After to observe protons produced by bombing of hydrogen of alpha particles (when observing the blinker that produces in screens covered with zinc sulfide), that occurs to account of obtains many of those blinkers if it still more realizes the same experiment with air and with pure nitrogen. It deduces of it that the alpha particles, when striking the nitrogen atoms, have produced a proton, that is to say that the nitrogen core has changed of nature and it has been transformed into oxygen, when absorbing the alpha particle. Rutherford finished producing the first artificial transmutation of history. Some think that she was the first alchemist who secured his target. Plum Pudding.

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