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Alpha Particle speed problem

  1. Jul 14, 2010 #1
    1. The problem statement, all variables and given/known data

    An Alpha Particle is emitted with a kinetic energy of 2.34 MeV during a radioactive decay process. The maximum speed of the alpha particle is?

    2. Relevant equations

    1 ev = 1.6x10-19j

    3. The attempt at a solution

    Unfortunately the manual uses this solution for the problem:


    Could anyone explain to me where the 2 comes from?
  2. jcsd
  3. Jul 14, 2010 #2
    Nevermind... I see what I did wrong..

    KE= 1/2 mv^2 DUHHHH
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