Q. $M_{n}$ and $M_{p}$ represent mass of neutron and proton respectively. If an element having atomic mass $M$ has $N$-neutrons and $Z$-protons, then the correct relation will be
A) $M < \lbrack NM_{n} + ZM_{P}\rbrack$
B) $M > \lbrack NM_{n} + ZM_{P}\rbrack$
C) $M = \lbrack NM_{n} + ZM_{P}\rbrack$
D) $M = N\lbrack M_{n} + M_{P}\rbrack$
Explanation
(a) Actual mass of the nucleus is always less than total mass of nucleons, so $M < (NM_{n} + Zm_{p})$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.