In a cubic close packed structure, fractional contributions of an atom at the corner and at the face in the unit cell are, respectively.
A
1/8 and 1/2
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B
1/2 and 1/4
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C
1/4 and 1/2
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D
1/4 and 1/8
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Solution
The correct option is A1/8 and 1/2 One corner atom is shared in 8 unit cells and one face centred atom is shared in 2 units cells, therefore, contribution are 1/8 and 1/2 respectively