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Excited vs. Ground state masses of atom

  1. Dec 7, 2009 #1
    1. In a certain gamma decay process, an excited neon atom emits a gamma-ray that has an energy of 1.630 MeV. The neon atom in the ground state has a mass of 19.992 435 u. What is the mass of the excited neon atom?



    2. I am pretty lost here. There must be a formula relating these energies to masses somewhere, but I do not know it.
     
  2. jcsd
  3. Dec 7, 2009 #2

    kuruman

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    Try E = mc2.
     
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