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What fraction of one edge centred octahedral void lies in one unit cell of fcc?
A
$\frac{1}{12}$
B
$\frac{1}{2}$
C
$\frac{1}{3}$
D
$\frac{1}{4}$
Explanation
Each cube edge is shared by 4 unit cells, so an edge-centre void contributes $\frac{1}{4}$.
Detailed Solution
One edge of a cube is common to four unit cells.
Hence one edge centre OV contributes $\frac{1}{4}$ to one unit cell.