Question

An element has a face-centred cubic (fcc ) structure with a cell edge of a. The distance between the centres of two nearest tetrahedral voids in the lattice is :

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

Answer 1

Answer: (A)

$\frac{a}{2}$

Answer 2

Distance between two nearest tetrahedral void $= \left( \frac{a}{2} \right)$