Q. If $m,m_{n}$ and $m_{p}$ are the masses of $\ _{Z}X^{A}$ nucleus, neutron and proton respectively, then
A) $m < (A - Z)m_{n} + Zm_{p}$
B) $m = (A - Z)m_{n} + Zm_{p}$
C) $m = (A - Z)m_{p} + Zm_{n}$
D) $m > (A - Z)m_{n} + Zm_{p}$
Explanation
(a) The mass of nucleus formed is always less than the sum of the masses of the constituent protons and neutrons $i.e.,m < (A - Z)m_{n} + Zm_{p}$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.