what gas was used in cathode ray and anode ray tube
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Explanation:
Cathode Rays
The gas ionization (or cold cathode) method of producing cathode rays used in Crookes tubes was unreliable, because it depended on the pressure of the residual air in the tube.
Anode rays
Goldstein used a gas-discharge tube which had a perforated cathode. When a high electrical potential of several thousand volts is applied between the cathode and anode, faint luminous "rays" are seen extending from the holes in the back of the cathode.
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