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Mini-Research - Paper

Mini-Research

ELECTRON- In 1897, Sir J. J. Thomas, an English physicist, measured the
deflection of cathode-ray particles in magnetic and electrical fields. As a
result he found the ratio of the charge, e, to the mass, m, of the cathode-ray
particles. He found e/m identical to those particles irrespective of the metal
the electrodes were made of or the kind of gas in the tube. In 1909, RA
Millikan, an American scientist, measured that charge. All electrons are found
to be identical no matter their source or the method of liberating them from
matter. From the values of e/m, and e, the mass of an electron was calculated
to be .00055 amu.

PROTON- Eugeen Goldstein used a Crookes tube with holes in ...

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m was calculated to be 1.0073 amu. This became known as
a proton.

NEUTRON- In 1932, James Chadwick detected the third of the basic parts of an
atom. He showed that uncharged particles, or neutrons, are emitted when atoms
of other elements are bombarded with high-velocity helium atoms with all
electrons remored, or an alpha particle. Neutrons were determined to have a
mass of 1.0087 amu. They are unstable outside of an atom and slowly degenerate
to form protons and ...

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PAPER DETAILS

Added: 5/16/2006 05:27:26 PM
Category: Science & Nature
Type: Premium Paper
Words: 286
Pages: 2

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