Physics, asked by javedakhtar2144, 1 year ago

When is purple light observed in the cathode ray experiment?

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Answered by DeepakDorle14007

A beam of cathode rays in a vacuum tube bent into a circle by a magnetic fieldgenerated by a Helmholtz coil. Cathode rays are normally invisible; in this demonstration tube enough residual gas has been left that the gas atoms glow from luminescence when struck by the fast moving electrons.

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