24 11 Na (atomic mass =23.990961 u) undergoes - decay and produces 24 12 Mg (ato
ID: 1749821 • Letter: 2
Question
2411Na (atomic mass =23.990961 u) undergoes - decay and produces 2412Mg (atomic mass =23.985042 u). Determine the energy (inMeV) released.Explanation / Answer
In beta decay, the energy released is equal to the mass lost in thereaction so: Na --> Mg + e 23.990961-23.985042-5.486799E-4=.00537032u now we convert that to MeV/c2(a unit of mass that ismore convenient here) 931.49(.00537032)=5.00224MeV/c2 Now using E=mc2 E=5.00224MeV/c2(c2)=5.00224MeV; thatconversion above could be done after this step if you wanted butthen you'll have to deal with multiplying everything by the speedof light...which i find annoying
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