What does "structure factor" mean? $(1$ point$).$ What are the conditions of "system extinction" for simple, face$-$centered, and body$-$centered cubic lattice systems? $(1$ point$).$ Which of the following planes can produce system extinction for simple, face$-$centered, and body$-$centered cubic lattice systems? $(100),(111),(120),(300),(311).(1$ point$).$ What are the other factors that affect the intensity of diffraction intensity? $(1$ point$).$