The Solid State - Result Question 26
####26. In face-centred cubic lattice, a unit cell is shared equally by how many unit cells? [2005]
(a) 2
(b) 4
(c) 6
(d) 8
Show Answer
Solution:
- (c)
An isolated fcc cell is shown here. Each face of the cell is common to two adjacent cells. Therefore, each face centre atom contributes only half of its volume and mass to one cell. Arranging six cells each sharing the remaining half of the face centred atoms, constitutes fcc cubic lattice. e.g., $Cu$ and $Al$.
