In an old-style television set, electrons are shot from the back end of the TV t

Question

In an old-style television set, electrons are shot from the back end of the TV to the front under the influence of an electric field approximately 25,000 N/C (the electrons hit the back of the TV screen to make light). Suppose the electric field points from right to left and the distance to the screen is 0.40 m. For an individual electron starting from rest at left, What is the magnitude of the velocity of an individual electron? What is the magnitude of the work done to the electron, in units of electron-volts?

Explanation / Answer

Potential difference from left to right => V = Ed = 25000N/C*0.4 m = 10000Volts

change in KE = change in PE

1/2 mv^2 = eV

v = sqrt(2eV/m) = 5.93 x 10^7 m/s = 6 x 10^7 m/s (approx.)

part B

work done = eV = 10000 eV

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