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Homework Help: Electric potential problem(s)

  1. Feb 27, 2008 #1
    1. The problem statement, all variables and given/known data

    Point A is at a potential of +250 V, and Point B is at a potential of -150 V. An alpha particle is a helium nucleus that contains 2 protons and 2 neutrons. An alpha particle starts from rest at A and accelerates toward B. When the alpha particle arrives at B, what Kinetic energy (in electron Volts) does it have?


    2. Relevant equations

    1 eV = 1.6 x 10^-19 J, W = -(EPEb - EPEa), V = EPE/q

    3. The attempt at a solution

    Vb - Va = -150 - 250

    Vb - Va = -400
     
  2. jcsd
  3. Feb 28, 2008 #2

    Kurdt

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    You know the potential difference and you have the charge. If the charge is accelerated through that PD then all the potential energy will be converted to kinetic energy.
     
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