Which of the following patterns has void fraction of 0.26?
A
AAAA.....
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B
ABABAB...
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C
ABCABCABC...
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D
ABCCBAABC...
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Solution
The correct option is CABCABCABC... ABCABCABC... patterns has void fraction of 0.26. It corresponds to ccp (cubic close packing) or fcc (face centered cubic) unit cell. Occupied space is 74% and empty space is 26%.