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In F.C.C. arrangement of identical spher...

In F.C.C. arrangement of identical spheres, distance between two nearest octahedral void is `89.51 A`. The distance between two nearest tetrahedral voids would be ?

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The correct Answer is:
6Å
distance between two octahedral void `=a/sqrt2=8.51`
a=8.51x1.41=12Å
distance between two tetrahedral void=a/2=6Å
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