First three nearest neighbor distances for simple cubic lattice are respectively (edge length of...

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First three nearest neighbor distances for simple cubic lattice are respectively (edge length of unit cell \( =a \) ):
(1) \( \mathrm{a}, \sqrt{2} \mathrm{a}, \sqrt{3} \mathrm{a} \)
(2) \( \sqrt{3} a, \sqrt{2} a, a \)
(3) \( \mathrm{a}, \sqrt{2} \mathrm{a}, 2 \mathrm{a} \)
(4) \( \mathrm{a}, \sqrt{3} \mathrm{a}, 2 \mathrm{a} \)
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