Excited vs. Ground state masses of atom

  • Thread starter danok
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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.
 

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kuruman
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Try E = mc2.
 

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