![]() ![]() To illustrate the effects of an electric field on a charged particle.To commemorate the discovery of the electron by J.As a result of his work, Thomson proposed a completely new model of the atom (Thomson’s Plum Pudding Model) that one of his students, Ernest Rutherford, would improve upon 10 years later.Ĭlick and drag the cursor to change the intensity of the voltage applied between the plates. This apparatus constitutes the first particle accelerator. Thomson, in 1897, isolated a new elementary particle carrying a negative charge – the electron. Thomson had shown that cathode rays behave as one would expect negatively charged material particles to behave. Michael Faraday demonstrated in 1830 that when electricity is transmitted through an electrolyte solution, chemical reactions occur at the electrodes, resulting in the liberation and deposition of matter at the electrodes. ![]() The very intense electric field that results from this accelerates the few ions present in the tube which, via collisions, ionize other particles. The lower the pressure, the more the electrons thus liberated and accelerated travel great distances until they strike the screen at the opposite end of the tube.īy studying the deviation of this beam, J. Cathode Ray Experiment was conducted by J.J Thomson to discover electrons. A high voltage (between 10 and 100 kV) is applied between two electrodes. Thomson’s second experiment involving the deviation of an electron beam in a vacuum tube, called a Crookes Tube.Ī partial vacuum (less than 10 -6 atm) is maintained in the tube. He showed that the cathode rays could penetrate thin layers of metal and travel about half a centimeter outside the tube before the phosphorescence produced is. ![]()
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