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Relation between Coefficient and Indices of x and y

A metal cryst...

Question

A metal crystallises in a face centred cubic structure. If the edge length of its unit cell is 'a', the closest approach between two atoms in metallic crystal will be

A

$2 a$

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B

$2 \sqrt{2} a$

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C

$\sqrt{2} a$

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D

$\frac{a}{\sqrt{2}}$

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Solution

The correct option is D
$\frac{a}{\sqrt{2}}$

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