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Calculate the energy spread of the Fe-57 first excited state

  1. Feb 24, 2013 #1
    1. The problem statement, all variables and given/known data

    Calculate the energy spread of the 57Fe first excited state, which has energy 14.4 keV and lifetime 141 ns.

    2. Relevant equations

    [tex]\Gamma\tau=\hbar[/tex]


    3. The attempt at a solution

    No idea what this is really asking me. is it really just
    [tex]\Gamma=\frac{\hbar}{\tau}[/tex]
    assuming it's not because it gave the energy...
     
  2. jcsd
  3. Feb 24, 2013 #2

    mfb

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    Staff: Mentor

    Is the energy used in any follow-up question?
    Otherwise, I think it is irrelevant. Lifetime alone gives the energy spread.
     
  4. Feb 24, 2013 #3
    nope, it was a single question. Guess it was a trick. Thanks.
     
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