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Packing fraction of ccp and bcc structures is respectively

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0.74; 0.74

0.68; 0.74

0.74; 0.68

0.68; 0.68

answer is C.

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Detailed Solution

$ccp; P . E = \frac{4 (\frac{4}{3} {πr}^{3})}{{(2 \sqrt{2} r)}^{3}} = 0.74; bcc; P . E = \frac{2 (\frac{4}{3} {πr}^{3})}{{(\frac{4 r}{\sqrt{3}})}^{3}} = 0.68;$

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