An element has a face-centred cubic (fcc) structure \( \mathrm{P} \) with a cell edge of a. The ...

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An element has a face-centred cubic (fcc) structure
\( \mathrm{P} \) with a cell edge of a. The distance between the centres

W of two nearest tetrahedral voids in the lattice is :
[JEE Main-2019 (April)]
(1) \( \frac{a}{2} \)
(2) a
(3) \( \frac{3}{2} \mathrm{a} \)
(4) \( \sqrt{2} a \)
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