Tuesday, July 5, 2011

Physics Form 5: Chapter 4 - Thermionic Emission

  • Thermionic emission is the release of electrons from a heated metal.
  • The electrons in the metal gain kinetic energy from heat. Electrons that gain sufficiently high kinetic energy will be able to escape from the surface of metal.

  • The tungsten filament act as cathode
  • Cathode ray is a beam of electrons moving at high speed in vacuum.

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