Problem 28.43 Part B With what speed does an electron exit the electron gun if i

Question

Problem 28.43

Part B

With what speed does an electron exit the electron gun if its entry speed is close to zero?

The electron gun in an old TV picture tube accelerates electrons between two parallel plates 1.3cm ^kv potential difference between them. The electrons enter through a small hole in the negative plate, accelerate, then exit through a small hole in the positive plate. Assume that the holes are small enough not to affect the electric field or potential part B With what speed does an electron exit the electron gun if its entry speed is close to zero? ^cm apart with a 20kV

Explanation / Answer

a)

Electric field

E=V/d =(20*10^3)/0.013

E=1.54*10^6 N/C

b)

By conservation of enery

qE=(1/2)mv^2

(1.6*10^-19)(1.54*10^6)=(1/2)*(9.11*10^-31)*v^2

v=7.35*10^8 m/s

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