If ‘Z’ is the number of atoms in the unit cell that represents the closest packing sequence — A B C A B C —, the number of tetrahedral voids in the unit cell is equal to
a. Z
b. 2 Z
c. Z/2
d. Z/4
Ans. b
Explanation : Number of tetrahedral voids in the unit cell
= 2 x number of atoms = 2 Z
(10)
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