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The number of atoms per unit cell and the number of slip systems, respectively, for a face-centered cubic (FCC) crystal are

  1. $3, 3$
  2. $3, 12$
  3. $4, 12$
  4. $4, 48$
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Option C

No of atoms on corners: 1/8*8 = 1

No of atoms on faces: 1/2*6 = 3

The number of atoms in FCC unit cell is the sum of no of atoms on corners and faces i.e., 1+3 = 4.

A slip system is composed of a slip plane and a slip direction. It occurs along the close-packed plane. Therefore, in FCC crystal, the number of slip systems is 12

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