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(A) The formation of a nucleus from its constituent nucleons (protons and neutrons) is accompanied by the release of energy,known as binding energy. A

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Decrease in mass

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(A) The formation of a nucleus from its constituent nucleons (protons and neutrons) is accompanied by the release of energy,known as binding energy. According to Einstein's mass-energy equivalence principle,$E = \Delta m c^2$,this energy release corresponds to a decrease in the total mass of the system. This difference in mass is known as the mass defect $(\Delta m)$,where the mass of the nucleus is less than the sum of the masses of its individual nucleons.

Formation of a nucleus from its nucleons is accompanied by:

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