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neutrino
neutrino [Ital.,=little neutral (particle)], elementary particle with no electric charge and a very small mass emitted during the decay of certain other particles. The neutrino was first postulated in 1930 by Wolfgang Pauli in order to maintain the law of conservation of energy during beta deca...
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chemical bond
chemical bond mechanism whereby atoms combine to form molecules . There is a chemical bond between two atoms or groups of atoms when the forces acting between them are strong enough to lead to the formation of an aggregate with sufficient stability to be regarded as an independent species. The n...
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Vladimir Kosma Zworykin
Vladimir Kosma Zworykin , 1889-1982, American physicist, b. Russia, educated in Russia, at the Collège de France, and at the Univ. of Pittsburgh (Ph.D., 1926). He became an American citizen in 1924. On the staff of the Radio Corp. of America after 1929, he became vice president and technical ...
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electricity
electricity class of phenomena arising from the existence of charge . The basic unit of charge is that on the proton or electron —the proton's charge is designated as positive while the electron's is negative. There are three basic systems of units used to measure electrical quantities, t...
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periodic table
periodic table chart of the elements arranged according to the periodic law discovered by Dmitri I. Mendeleev and revised by Henry G. J. Moseley . In the periodic table the elements are arranged in columns and rows according to increasing atomic number (see the table entitled Periodic Table...
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electron-volt
electron-volt abbr. eV, unit of energy used in atomic and nuclear physics; 1 electron-volt is the energy transferred in moving a unit charge , positive or negative and equal to that charge on the electron, through a potential difference of 1 volt. The maximum energy of a particle accelerator i...
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Robert Andrews Millikan
Robert Andrews Millikan , 1868-1953, American physicist and educator, b. Morrison, Ill., grad. Oberlin College, 1891, Ph.D. Columbia, 1895, studied in Germany. He taught (1896-1921) physics at the Univ. of Chicago and from 1921 to 1945 was chairman of the executive council of the California Institut...
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electron
electron elementary particle carrying a unit charge of negative electricity. Ordinary electric current is the flow of electrons through a wire conductor (see electricity ). The electron is one of the basic constituents of matter. An atom consists of a small, dense, positively charged nucleus s...
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electron microscope
electron microscope Microscope used for producing an image of a minute object. It ‘illuminates’ the object with a stream of electrons, and the ‘lenses’ consist of magnets that focus the electron beam. Smaller objects can be seen because electrons have shorter wavelengths...
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Airdrie
Airdrie , town (1991 pop. 45,320), North Lanarkshire, S central Scotland. Chemicals and electrical and electronic equipment are produced. There are facilities for electronic research. Airdrie's free library was the first established in Scotland.
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