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Relation Between r and a

In FCC unit c...

Question

In FCC unit cell edge length is

A

\frac{4}{\sqrt{3}} r

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B

\frac{4}{\sqrt{2}} r

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C

2 r

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D

\frac{\sqrt{3}}{2} r

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Solution

The correct option is B $\frac{4}{\sqrt{2}} r$
$I n f c c 4 r = \sqrt{2} a a = \frac{4 r}{\sqrt{2}}$

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