Closest distance between two octahedral voids in FCC unit cell having edge length a: (1) \( \fra...

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Closest distance between two octahedral voids in FCC unit cell having edge length a:
(1) \( \frac{a}{2} \)
(2) \( \frac{\mathrm{a}}{\sqrt{2}} \)
(3) \( \frac{\sqrt{3} a}{4} \)
(4) \( \mathrm{a} \)
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