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Decay of particle

  1. Apr 9, 2014 #1
    1. The problem statement, all variables and given/known data


    A plutonium-239 nucleus at rest decays into a uranium-235 nucleus by emitting an alpha particle (4He) with kinetic energy of 5.15 MeV.

    Find the speed of the uranium nucleus.

    3. The attempt at a solution

    How should I approach this problem?

    m1v1=-m2v2
    1. The problem statement, all variables and given/known data



    2. Relevant equations



    3. The attempt at a solution
     
  2. jcsd
  3. Apr 9, 2014 #2

    BruceW

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    yeah, keep going. So, what is m2 and m1 ?
     
  4. Apr 9, 2014 #3

    Its not given?
     
  5. Apr 10, 2014 #4

    BruceW

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    Homework Helper

    I guess you are meant to look them up.
     
  6. Apr 10, 2014 #5

    ehild

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    Gold Member

    You know the masses, but need the speed of the alpha particle. Calculate it from the given KE.

    ehild
     
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