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why is the cathode ray tube attached to a vacuum pump?

A cathode ray tube is generally operated at a low air pressure. So, air has to be pumped out of the cathode ray tube. Therefore, it is usually connected to a vacuum pump.

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This is to control the pressure.Gases can conduct electricity only under very low pressure and on supply of very high voltage.Only then can the cathode rays emerge.

hope this helps u

srry if iam wrong

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