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(C) Cathode rays are produced in a discharge tube at low pressure. The typical pressure required for the production of cathode rays is approximately $

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$0.01 \ mm$ of $Hg$

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(C) Cathode rays are produced in a discharge tube at low pressure. The typical pressure required for the production of cathode rays is approximately $0.01 \ mm$ of $Hg$ (or $10^{-2} \ mm$ of $Hg$).At this low pressure,the mean free path of the electrons becomes large enough to allow them to accelerate towards the anode without frequent collisions with gas molecules.If the pressure is higher,the number of gas atoms increases,leading to more frequent collisions between electrons and gas atoms,which obstructs the flow of electrons and prevents the formation of a stable cathode ray beam.

Cathode rays are produced when the pressure is of the order of

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