Discovery of Electrons (Cathode Rays)

Discovery of Electrons (Cathode Rays)


  • A gas discharge tube is fitted with metal electrodes known as cathode and anode.
  • This glass tube is filled with Gas.The Electrodes are connected with high voltage battery.
  • The exact voltage required depend upon the length of glass tube and pressure of gas inside tube.
  • A vacuum pump is attached to glass side from a side in order to decrease pressure of gas inside tube.
  • It is observed that current does not flow through gas at ordinary pressure.
  • When pressure of Gas is reduced to 0.01 torr and high current of 5000-10000 voltages is applied,electric discharge takes place through the gas.
  • Some rays are produced which creates greenish fluorescene on the walls of glass tube.
  • As these rays were produced from Cathode they were named as "cathode rays".
  • The colour of glow or fluorescene produced on the walls of glass depends upon the composition of glass.
electrons,cathoderays


Discovery of Electrons (Cathode Rays) Discovery of Electrons (Cathode Rays) Reviewed by M.Zulqarnain on 23:34 Rating: 5

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