Q) The electron beam inside an old television picture tube is 0.40 mm in diameter and...

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Q) The electron beam inside an old television picture tube is 0.40 mm in diameter and...

Q) The electron beam inside an old television picture tube is 0.40 mm in diameter and carries a current of 50 μA. This electron beam impinges on the inside of the picture tube screen.

Part A How many electrons strike the screen each second?

Ans: 3.1×10¹⁴ electrons

Part B: What is the current density in the electron beam?

Ans:

J

=

400 Am2

Part C: The electrons move with a velocity of 3.6 ×107 m/s. What electric field strength is needed to accelerate electrons from rest to this velocity in a distance of 5.0 mm?

Part D: Each electron transfers its kinetic energy to the picture tube screen upon impact. What is the power delivered to the screen by the electron beam?

Need Answer only for part C and D

science physics

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