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Homework Help: Particle Collision

  1. May 27, 2008 #1


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    1. The problem statement, all variables and given/known data
    The results of particle collisions are observed using particle detectors. Sometimes the products of these collisions are themselves unstable and decay to give further particles; the products of decay can be photons.

    In one collision, a stationary [itex]\pi^\circ[/itex] meson is produced which then decays to give two gamma ray photons. The rest mass of the meson is [itex]135 \ MeV/c^2[/itex].

    [itex]\pi ^\circ \rightarrow \beta + \beta[/itex]​

    Calculate the wavelength of each photon.

    2. Relevant equations
    [itex]E = hf = \frac{hc}{\lambda}[/itex]

    3. The attempt at a solution
    How can I find [itex]E[/itex]? I can carry on from that point but I don't know which equation to use to find [itex]E[/itex]?
    Last edited: May 27, 2008
  2. jcsd
  3. May 27, 2008 #2
    The energy of the stationary meson is calculated using E = mc2

    Epi = mpi*c2 = 135 MeV / c2 * c2 = 135 MeV
    Last edited: May 27, 2008
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