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Homework Help: Electron in an electirc field.

  1. Feb 21, 2007 #1
    1. The problem statement, all variables and given/known data

    Across what potential difference does an electron have to be accelerated in order to reach speed v=1.80×106 m/s?

    2. Relevant equations

    I checked to see if relitivity was important and it was not
    E=.5 m v^2=eV

    3. The attempt at a solution

    I dunno if I am mistaken in what I am trying to find but I thought the potential difference in this case was .5mv^2 But when I plug in 9.109x10^-31 kg in for the mass and 1.8x10^6 m.s for the velocity I don't get the right answer. I do not know what I am doing wrong.
  2. jcsd
  3. Feb 21, 2007 #2
    I figured out what I was doing wrong. It was in Joules and I needed to convert to Volts.
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