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Equation Needed to Figure Resulting Kinetic Energy and Velocities from Fusion

  1. May 11, 2009 #1
    Equation Needed to Figure Resulting Kinetic Energy and Velocities from Fusion....

    1. The problem statement, all variables and given/known data

    Hey,
    I am have the initial velocities and masses of nuclei involved in fusion, and am trying to figure out the resulting velocities and kinetic energies. Since this is an inelastic reaction, i cant use Kinetic energy, as it is not conserved. I have the conservation of momentum to use, because it is conserved, but to use it I still need to find velocity. What could i use to find this? Also, if you could clarify how to find the kinetic energies for each resulting particle, it would be greatly appreciated!


    2. Relevant equations

    Deuterium+Deuterium--> Helium-3 + neutron
    each deuteron has K.E. of 69.91 KeV, and a velocity of 2.59 x 10^6 m/s

    3. The attempt at a solution
    I have already decided that the Law of Conservation of Momentum would be a good equation to use, but i still need an equation to get velocity.


    Note: This is not a Homework question, per se. It was simply moved here.
    1. The problem statement, all variables and given/known data



    2. Relevant equations



    3. The attempt at a solution
     
  2. jcsd
  3. May 11, 2009 #2

    diazona

    User Avatar
    Homework Helper

    Re: Equation Needed to Figure Resulting Kinetic Energy and Velocities from Fusion....

    Well... the total energy [tex]E = \sqrt{p^2 c^2 + m^2 c^4}[/tex] is conserved, you should be able to use that. You'll probably need to look up the rest masses of helium-3 and of the neutron but I don't think they'd be hard to find online.
     
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