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Electric Current: Velocity of electron in a beam; Current of a beam

In a certain electron beam, there are 5.0 x 10^6 electrons per cubic centimeter. Suppose the kinetic energy of each electron is 10 keV and the beam is cylindrical with a diameter of 1 mm.

(a) what is the velocity of an electron in the beam?
(b) find the beam current.

Solution Preview

Ek = m*v*v/2 => v = sqrt(2*Ek/m)

Ek = 10 keV= 1E4 eV = ...

Solution Summary

With full formulas, the problem is solved.