Question: Q. 2. Write the relation for binding energy (BE) (in $\mathrm{MeV}$ ) of a nucleus of mass ${ }_{Z}^{A} \mathrm{M}$, atomic number $(Z)$ and mass number $(A)$ in terms of the masses of its constituents - neutrons and protons.
R [Delhi Comptt. I, II, III 2014]
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Solution:
Ans. B.E. $=\left[Z M_{P}+(A-Z) M_{n}-M_{N}\right] \times c^{2}=\Delta M c^{2} \quad \mathbf{1}$
[CBSE Marking Scheme 2014]