The masses of proton, neutron and helium nucleus are respectively 1.0073 u, 1.0087 u and 4.0015 u. The binding energy of helium nucleus is:
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Question

The masses of proton, neutron and helium nucleus are respectively 1.0073 u, 1.0087 u and 4.0015 u. The binding energy of helium nucleus is:

G1 Physics · Accepted Answer

Mass defect Δm = 2m(p)+2m(n)−m(He) = 2(1.0073)+2(1.0087)−4.0015 = 0.0305 u. Binding energy ≈ 0.0305×931.5 MeV ≈ 28.4 MeV.