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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?

User Tim McDonald
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If the cathode ray tube is not evacuated, the electrons emitted collide with the air molecules and cannot reach the screen effectively. Therefore, the CRT is connected to a vacuum pump to remove air.
User Nick Gammon
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