An element crystallises in a face-centred cubic (fcc) unit cell wit...

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An element crystallises in a face-centred cubic (fcc) unit cell with cell edge a. The distance between the
P centres of two nearest octahedral voids in the crystal

W lattice is
[JEE Main-2020 (September)]
(1) \( \mathrm{a} \)
(2) \( \sqrt{2} a \)
(3) \( \frac{a}{\sqrt{2}} \)
(4) \( \frac{a}{2} \)
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