Semiconductor Electronics Materials Devices and Simple Circuits - Result Question 23
23. Sodium has body centred packing. Distance between two nearest atoms is $3.7 \AA$. The lattice parameter is
(a) $4.3 \AA$
(c) $8.6 \AA$
(b) $3.0 \AA$
(d) $6.8 \AA$
[2009]
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Answer:
Correct Answer: 23. (a)
Solution:
(a) $d=\frac{\sqrt{3}}{2} a$
$3.7=\frac{\sqrt{3}}{2} a$
$a=\frac{2 \times 3.7}{\sqrt{3}}=4.3 \AA$
