![]() ![]() Thomson carried out three experiments to come to his conclusion. Thomson performed experiments to probe the properties of cathode rays. ![]() He experimented with currents of electricity inside empty glass tubes. First, he used a magnet and electrometer to observe that the cathode rays were indeed electrically charged. However, the positively charged part of an atom was not yet well understood. What was the Cathode Ray Experiment Thomson started the Cathode Ray experiment in the 1894 at the Cavendish Laboratory at Cambridge University. Thomson performed three experiments with cathode ray tubes. Scientists had now established that the atom was not indivisible as Dalton had believed, and due to the work of Thomson, Millikan, and others, the charge and mass of the negative, subatomic particles-the electrons-were known. Thomson theorized that the traces of gas remaining in the tube were being turned into an electrical conductor by the cathode rays themselves, and managed to. In a cathode ray tube experiment, when the pressure is reduced to 0.01 mm Hg, the original uniform glow disappears and the tube is filled up by dark space. ![]()
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