Question

in cathode ray discharged tube why is a gas used it it what is the role played by the gas?​

Answer 1

Answer:

it was used in discovery of cathode rays

At low pressure (10−2 atm) and higher voltage (10000 V) gases are partially ionised in the discharge tube. Positive ions of gases strike on the cathode. Due to the thermal effect, a beam of electrons releases from the surface of the cathode

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Answer 2

Hey mate...

The plate connected to the positive terminal is called "ANODE" the other connected to negative terminal is called "CATHODE". The tube is filled with any gas. In discharge tube experiment, at low pressure and at very high voltage, an electric current is passed.

To release electrons into the tube, they first must be detached from the atoms of the cathode. In the early cold cathode vacuum tubes, called Crookes tubes, this was done by using a high electrical potential of thousands of volts between the anode and the cathode to ionize the residual gas atoms in the tube.

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