Question

Q.1) Why is low pressure is evacuated in Cathode Ray Tube?
Q.2) Why is high voltage used in Cathode Ray Tube?

Answer 1

Answer:

1)The cathode ray tube is evacuated to a low pressure so that the electrons can move without being obstructed by air molecules

2)Having a high voltage across the tube means that an electron can gain more kinetic energy between collisions with the air molecules and thus a smaller distance between gas molecules (not quite so low a pressure) can be used.

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