Topic: Material Science
The effective number of lattice points in the unit cell of simple cubic, body centered cubic and face centered cubic space lattices, respectively are
- A. 1, 2, 2
- B. 1, 2, 4
- C. 2, 3, 4
- D. 2, 4, 4
Answer: B. 1, 2, 4
Explanation: For a Simple Cubic (SC) unit cell, there are 8 corner atoms, each contributing 1/8, resulting in 1 effective atom. For a Body-Centered Cubic (BCC) cell, there is 1 effective corner atom plus 1 full atom in the interior center, making 2 effective atoms. For a Face-Centered Cubic (FCC) cell, there is 1 effective corner atom plus 6 face-centered atoms each contributing 1/2 (totaling 3), resulting in 4 effective atoms.