1 electronvolt - the energy required to move an electron through a potential of one volt., Electron - the individible quantity of charge that orbits the nucleus of an atom., Thermionic emission - the emission of electrons from the surface of a hot metal., Work function - minimum energy needed to remove the most loosely bound electrons from the surface of a metal., Cathode Ray Tube - evacuated glass tube which directs a beam of electrons to a flourescent screen., Scintillation - bright spot of light on a flouescent screen., Robert Millikan  - measured the charge of an electron., G.J. Stoney  - introduced the term 'electron'., X-ray - electronmagnetic radiation of extremely low wavelength and high frequency. , Photon - a bundle of light energy., Photoelectric effect - emission of electrons from the surface of a metal by electromagnetic radiation of a suitable frequency., f0 - threshold frequency., Threshold frequency - the minimum frequency needed to cause photoelectric emission. , Photoelectric Law - the energy of the fastest electron emitted is the difference between the energy of the photon the workfunction of the metal., Planck's constant - number relating the frequency and energy of a photon.,

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