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Homework Help: Special Relativity Decay

  1. May 19, 2010 #1


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

    A K meson has a total energy of 890 MeV in a laboratory where it decays along
    its line of flight into two π mesons. At what speed is the K meson travelling in the
    laboratory frame prior to the decay? What are the velocities and energies of the π
    mesons in the laboratory frame?

    2. Relevant equations

    3. The attempt at a solution

    Would the two pi mesons be moving together? If so, I know how to solve the problem...

    If they would be - why do they? If not, why not?
  2. jcsd
  3. May 19, 2010 #2

    Andrew Mason

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    Homework Helper

    What are the rest masses of the K meson and [itex]\pi[/itex] mesons? You will need that information to solve this problem.

    What is conserved here? Can it be conserved if the [itex]\pi[/itex] mesons are moving at the same speed as the K meson was? If not, can they change speed and still be moving together ?

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