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Homework Help: Recoil Energy

  1. Apr 4, 2005 #1
    What is the recoil energy (in eV) of a 57Co nucleus
    emitting a 14.4 keV gamma ray?

    If anyone knows the equation that I can use, thanks.
  2. jcsd
  3. Apr 4, 2005 #2


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    Homework Helper

    Since the energy of the photon is small (i think it's not [itex] \gamma[/itex],are u sure it's not MeV...?),you can use the nonrelativistic formula for KE...

    For a nice use of the total momentum conservation law ,assume the nucleus to be initially at rest.

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