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Homework Help: Change in Classical Velocity of an Electron

  1. Jan 8, 2009 #1
    1. The problem statement, all variables and given/known data
    Copper nucleus at origin and an electron initially 2 A away from origin. Electron moved to 1A away from origin. What is the change in classical velocity of the electron?

    2. Relevant equations
    PE= (kq1q2)/r
    change in PE from distance of 2A = KE

    3. The attempt at a solution
    change in PE from distance of 2A = KE
    KE = 1/2mv^2
    Change in PE =PE2-PE1=1/1-1/2= 1-1/2=1/2 J
    KE=1/2m(v2-v1)^2=1/2 J
    and solve for v2-v1???
    I dont think Im understanding this right.
  2. jcsd
  3. Jan 8, 2009 #2
    I assume that the electron is orbiting the nucleus, you can use a certain equation to find the force on the electron, and you know how many protons copper nucleus has. use this to find the velocites.
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