What is the packing efficiency of face-centered cubic (FCC) lattice?
Q1. What is the packing efficiency of face-centered cubic (FCC) lattice?
Answer: 74%
Explanation: FCC has 4 atoms per unit cell. Packing efficiency = (4 * (4/3) * π * r³) / a³, where a = 2√2r. Simplifying gives 74%.