If radius of an octahedral void is \( \mathrm{r} \) and atomic radius of atoms assuming cubical ...

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If radius of an octahedral void is \( \mathrm{r} \) and atomic radius of atoms assuming cubical close packing is \( \mathrm{R} \). Then the relation between \( \mathrm{r} \) and \( \mathrm{R} \) is
(1) \( r=2 R \)
(2) \( r=1.414 \mathrm{R} \)
(3) \( r=0.414 \mathrm{R} \)
(4) \( r=\frac{R}{\sqrt{2}} \)
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