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The masses of neutron and proton are 1.0087 a.m.u. and 1.0073 a.m.u. respectively. If the neutrons and protons combine to form a helium nucleus (alpha particles) of mass 4.0015 a.m.u. The binding energy of the helium nucleus will be (1 a.m.u. = 931 MeV )

1. 28.4 MeV
2. 20.8 MeV
3. 27.3 MeV
4. 14.2 MeV

Correct answer: 28.4 MeV

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