Mini-research Mini-Research ELECTRON- In 1897, Sir J. J. Thomas, an English physicist, measured the deflection of cathode- ray of illuminate particles in magnetised and electrical fields. As a pass on he frame the ratio of the charge, e, to the rush, m, of the cathode-ray particles. He build e/m homogeneous to those particles irrespective of the metal the electrodes were made of or the kind of gunslinger in the tube. In 1909, RA Millikan, an American scientist, measured that charge. all in all electrons are found to be identical no look their source or the method of liberating them from matter. From the values of e/m, and e, the mass of an electron was metric to be .
00055 amu. PROTON- Eugeen Goldstein used a curve 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 rays to be positively charged. The ratio of charge to mass was smaller than electrons, b...If you call for to get a full essay, order it on our website:
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