(1) Silicon (atomic wt. 28.09) has a diamond cubic structure with a lattice parameter of 5.42 A. Calculate the atomic packing factor and linear density along [111] direction in silicon (ii) Give the Miller Indices of the family of close packed directions in SC BCC and FCC crystals. What is the magnitude of the closest distance of approach between neighbouring atoms in SC, BCC, and FCC crystals? (5,5) (1) Silicon (atomic wt. 28.09) has a diamond cubic structure with a lattice parameter of 5.42 A. Calculate the atomic packing factor and linear density along [111] direction in silicon (ii) Give the Miller Indices of the family of close packed directions in SC BCC and FCC crystals. What is the magnitude of the closest distance of approach between neighbouring atoms in SC, BCC, and FCC crystals? (5,5)