####31. The number of atoms in one of this hcp unit cell is
$$ (2008,3 \times 4 M=12 M) $$
(a) 4
(b) 6
(c) 12
(d) 17
Correct Answer: 31. (b)
Solution:
A hcp unit cell
Contribution of atoms from corner $=1 / 6$
Contribution from face centre $=1 / 2$
$\Rightarrow$ Total number of atoms per unit cell $=12 \times \frac{1}{6}+2 \times \frac{1}{2}+3=6$
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