Q$1.$ Give a brief definition of a unit cell?

Q$2.$ Schematically diagram face centered cubic body and hexagonal close packed

unit cell.

Q$3)-$ How to solve the Atomic Packing Factor FCC for cubic. What is the $\%$ of

empty $?$

Q$4-$ On the unit cell below, draw the listed direction in the top raw, and

determine the Miller ratio?

$\{[1,0,0]\},\{[1,1,0]\},\{[1,1,1]\},\{[2,1,0]\},\{[1,1,0]\}$

Q$5-$ Explain Grahams law of Effusion?

Q$6-$ Write $2$ examples of diffusion in everyday life?