The electric beam inside a television picture tube is 0.40 mm in diameter and carries a current of 50uA. This electron beam impinges on the inside of the picture tube screen.

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The electric beam inside a television picture tube is 0.40 mm in diameter and carries a current of 50uA. This electron beam impinges on the inside of the picture tube screen.
(a) How many electrons strike the screen each second?
(b) What is the current density in the electron beam?
(c) The electrons move with a velocity of 4.0E7 m/s. What electric field strength is needed to accelerate electrons from rest to this velocity in a distance of 5.0mm?
(d) Each electron transfers its kinetic energy to the picture tube screen upon impact. What power delivered to the screen by the electron beam?

The Correct Answer is

30.4

Reason Explained

30.4 is correct for The electric beam inside a television picture tube is 0.40 mm in diameter and carries a current of 50uA. This electron beam impinges on the inside of the picture tube screen.

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