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Essay Galaxy - Mini-Research
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 the cathode, and
observed that another kind of ray was emitted from the anode and passed through
the holes. He discovered this in 1886. In 1889, William Wien showed these ray....
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Number Of Pages: 2 |
Number Of Words: 301 |
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