while michael faraday's cathode ray experiment ,first the pressure in the tube was 1mm,then 0.1mm and then 0.001mm.the cathode rays were only emmited when pressure was 0.001mm.why?

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Solution

It is not true that cathode ray were not emitted at higher pressure. But it could not be studied at higher pressure.
Low pressure maintained in the cathode ray tube while performing a cathode ray experiment was to minimise the influence of gaseous ionization present in the discharge tube and then to observe the anticipated deflection of the cathode rays by means of an electric field.
If the pressure is not lowered inside the tube, then there would be excessive ionization of the gas present in the discharge tube, thus offsetting the effect of the electric field in deflecting cathode rays.

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