Q. The density for simple cubic lattice is (where $A$ is atomic weight, $N$ is Avogadro’s number and $a$ is a lattice parameter)
A) $\frac{4A}{Na^{3}}$
B) $\frac{2A}{Na^{3}}$
C) $\frac{A}{Na^{3}}$
D) $\frac{A}{Na^{2}}$
Explanation
(c) In simple cubic lattice, volume, $V = a^{3}$
$density = \frac{mass\ of\ unit\ cell}{volume\ of\ unit\ cell} = \frac{A/N}{V} = \frac{A}{Na^{3}}$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.