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Doubt & Answer Explanation

Doubt

explain why the mass of nucleus in its ground state is always less than the total mass of its constituents?

Answer Explanation

Nuclei are made up of protons and neutron, but the mass of a nucleus is always less than the sum of the individual masses of the protons and neutrons which constitute it. The difference is a measure of the nuclear binding energy which holds the nucleus together. This binding energy can be calculated from the Einstein relationship:
Nuclear binding energy = ?mc²

^{For the alpha particle ?m= 0.0304 u which gives a binding energy of 28.3 MeV.}

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