In the diamond cubic structure, carbon atoms form an FCC while the other carbon atoms occupy alternate tetrahedral voids, the atoms being connected by covalent bonds. Then the packing efficiency is approximately
A
56%
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B
68%
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C
74%
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D
34%
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Solution
The correct option is D 34% √3a4=2R,R=√38a∴η=8×43πR3a3×100=8×43π3√383×100=π√316×100=34%