SIR WILLIAM CROOKS

 Sir William Crooks



He was born in 1832 and died at 1919. He was a British chemist and physics. He was pioneer of vacuum tubes. He worked on spectrocopy.

           "He performed experiment by passing electric current                     through gases in a discharges  tube at very low                                   pressure.He took a glass tube fitted with two metallic                         electrod, which connected to a high voltag                                         battery.When high    voltag current was passed                                 through the gas,shiny rays were emitted from the                               cathod towards the anode .These rays called Cathode                       Rays."

•   Theserays travel in a straight lines perpendicular to the           cathode surface.
•   They rise a temperature of the body on which they fall.
•   Light is produced when these rays hit the walls of the               discharge tube.
•   J.J Thomson discoverd their charge/mass (e/m) ratio.
•   They can cast a sharp shadow of an apaque object if placed     in their path.

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