Beginning in the 1890s, Lenard investigated the attenuation of electron beams passing through matter. This attenuation can have two causes: the electrons can lose their energy by exciting or ionising atoms, or they can be elastically scattered and so change their directions and leave the beam. Lenard produced the beam by means of a cathode ray tube. Today, one would use thermionic emission as the electron source.
KeywordsTorque Attenuation Helium Sine Librium
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