Question

In face centred cubic unit cell, edge length is

• A. $\frac{4}{\sqrt{3}}r$
• B. $\frac{4}{\sqrt{2}}r$
• C. $2r$
• D. $\frac{\sqrt{3}}{2}r$

Answer 1

Answer: (B)

In $FCC$,
$4r=\sqrt{2}a$
$a=\frac{4r}{\sqrt{2}}$