Binding energy of a nucleus is

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(C) The binding energy of a nucleus is defined as the energy equivalent of the mass defect. When nucleons (protons and neutrons) come together to form

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Loss of energy from the nucleus during its formation

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(C) The binding energy of a nucleus is defined as the energy equivalent of the mass defect. When nucleons (protons and neutrons) come together to form a stable nucleus, the mass of the nucleus is found to be less than the sum of the individual masses of the constituent nucleons. This difference in mass, known as the mass defect $(\Delta m)$, is released as energy during the formation of the nucleus. Therefore, the binding energy is the energy released from the nucleus during its formation, which is equivalent to the work required to disassemble the nucleus into its constituent nucleons. Thus, option $(C)$ is the correct description.

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