Lenard rays

plural noun
Le·nard rays | \ˈlāˌnärt-, ləˈnärd-\

Definition of Lenard rays 

: a mixture of cathode rays that have emerged from a vacuum tube into the outside space through a window consisting of a piece of thin metal foil and rays emitted by the foil as a result of the incidence of the cathode rays

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History and Etymology for Lenard rays

after Philipp Lenard †1947 German physicist

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