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Homework Help: Electricity Question

  1. Jan 11, 2010 #1
    1. The problem statement, all variables and given/known data

    Protons from a Van de Graaff accelerator are released from rest at a potential of 20MV and travel through a vacuum to a region of 0 potential.
    Charge of electron is 1.6x10^-19C and mass of electron is 1.67x10^-27kg
    Find the final speed of the 5MeV protons
    Answer in units of m/s

    2. Relevant equations

    eV=U=-.5mv^2
    maybe some others. im not sure

    3. The attempt at a solution

    To be honest I have no idea where to even start. Im not sure why they give me info on electrons then ask about protons. I just need a starting point

    Thanks for any help
     
  2. jcsd
  3. Jan 12, 2010 #2

    ideasrule

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    Homework Helper

    I think they simply screwed up and meant to give you the data on protons. It's also interesting why travelling through a 20MV potential difference would give the protons 5MeV. Shouldn't it be 20MeV?
     
  4. Jan 12, 2010 #3
    Yeah i talked to my teacher to day and she said it was a screw up.
    Thanks though
     
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