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

An element has a face-centred cubic (fcc) structure with a cell edge o

1.	An element has a face-centred cubic (fcc) structure with a cell edge of a. The distance between the centers of two nearest tetrahedral voids in the lattice is:
A.	\(\sqrt 2 {\rm{a}}\)
B.	a
C.	\(\frac{a}{2}\)
D.	\(\frac{3}{2}{\rm{a}}\)
Answer» D. \(\frac{3}{2}{\rm{a}}\)