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Why is a cathode ray tube connected to a vacuum pump?

Why is a cathode ray tube connected to a vacuum pump?
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Why is a cathode ray tube connected to a vacuum pump?

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User Hazarapet Tunanyan
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A cathode ray tube functions at a low pressure air pressure. To do this, air has to be pumped out of the tube. Therefore, a vacuum pump has to be used. Cathode rays can't penetrate through any amount of air. Hope this answers the question.
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User Noampz
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