Speed of an Electron Out of an Electron Gun

  • Mines
The times they are a-changin’.

This post seems to be older than 14 years—a long time on the internet. It might be outdated.

An electron gun fires electrons at the screen of a television tube. The electrons start from rest and are accelerated through a potential difference of 32200 V. Ignoring relativistic effects, what is the speed of impact of the electrons with the screen of the picture tube?
1.08878×108 m/s

CAPA is done. Well, almost. I have to ask Ruskell about one question.


3 thoughts on “Speed of an Electron Out of an Electron Gun”

  1. Hah..I should’ve realized that the answer was obviously wrong.

    I thought the potential difference would be converted to kinetic energy fully so I just equated 32,200 to .5mv^2, using the mass of an electron.

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