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Q.
The number of atoms in a simple cubic unit cell are :
AFMCAFMC 2003
Solution:
Number of unit cell in simple cubic $=1$ atom/ unit cell
$8$ (at corners) $\times \frac{1}{8}=1$ atom
Body centered cubic $=2$ atoms/unit cell
($8$ at comers) $\times \frac{1}{8}+1$ (at body centre) $\times 1=2$ atoms
face centered cubic $=4$ atom/unit cell
$=8$ (at corner) $\times \frac{1}{8}+6$ (at face centres $\times \frac{1}{2}=4$ atoms
face centered tetragonal $=4$ atoms per unit cell