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Q.

If ‘Z’ is the number of atoms in the unit cell that represents the closest packing sequence --- A B C A B---, the number of tetrahedral voids in the unit cell is equal to

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a

Z

b

2Z

c

Z/2

d

Z/4

answer is B.

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Detailed Solution

Number of tetrahedral voids in the unit cell =2×number of atoms = 2Z. NOTE :: In fcc or ccp, number of tetrahedral voids is twice to the number of particles. Tetrahedral voids  are located along the body diagonal and on each body diagonal two tetrahedral voids are present
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