First three nearest neighbour distance for body centered cubic lattice are respectively: (a) a, ...

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First three nearest neighbour distance for body centered cubic lattice are respectively:
(a) a, \( \sqrt{2} \mathrm{a}, \sqrt{3} \mathrm{a} \)
(b) \( \sqrt{3} a, \sqrt{2} a, a \)
(c) \( \frac{\sqrt{3} \mathrm{a}}{2}, \mathrm{a}, \sqrt{2} \mathrm{a} \)
(d) \( \mathrm{a}, \sqrt{3} \mathrm{a}, 2 \mathrm{a} \)
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