Nuclear Binding Energy: The neutral helium atom, 
He, has a mass of 4.002603 u, a neutron has a mass of 1.008665 u, a proton has a mass of 1.007277 u, and a neutral hydrogen atom has a mass of 1.007825 u. What is the binding energy of the 
He nucleus? (1 u = 931.5 MeV/c2)
A. 20.5 MeV
B. 22.4 MeV
C. 27.3 MeV
D. 28.3 MeV
E. 23.4 MeV
Answer: D
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