![]() ![]() The existence of the electron showed that the 2,000-year-old conception of the atom as a homogeneous particle was wrong and that in fact the atom has a complex structure. Their work culminated in the discovery by English physicist J.J. These positively charged particles were named as protons by a British scientist, Ernest Rutherford.Ĭanal rays were also called anode rays because they emitted from the anode (electrode connected to the positive terminal of a high-voltage source) in the gas discharge experiments using perforated cathode. During the 1880s and ’90s scientists searched cathode rays for the carrier of the electrical properties in matter. Thus, Goldstein concluded that an atom contains positively charged particles along with the electrons. What is the Cathode Ray Tube Experiment In 1897, great physician J.J. When an electric field was applied, these rays deflected towards the negatively charged plate. He found that positively charged rays were emitted from the anode in the discharge tube. Goldstein modified the discharge tube and passed an electric current through it. contribution was the development of a better vacuum pump that allowed him to produce cathode-ray tubes with a smaller residual gas pressure. Thomson studied the characteristics and the constituents of cathode rays.Ī German scientist, E. The definitive experiments with cathode-ray tubeswere done by William Crookes in 1879. Hence, these rays are called cathode rays. The cathode ray tube experiment refers to the 1897 experiment performed by J.J. This fluorescence is the result of rays emitted from the cathode (negative plate) towards the anode (positive plate) in the discharge tube. When a high-voltage electric current is passed through the discharge tube containing a gas at a very low pressure, a green fluorescence is seen coming out of the other end of the discharge tube. ![]() Experiments on the discharge tube were first conducted in 1878 by an English physicist, William Crookes. The study of atomic structure and sub-atomic particles was initiated by the discovery of the discharge tube. ![]()
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