(a) Show that the distance between two nearest neighbouring atoms in an fcc structure is a/v2, being the edge of conventional cubic unit cell. (b) Diamond lattice is combination of two interpenetrating fcc lat-tices displaced relative to each other along the body diagonal by a/4. Obtain the nearest neighbour distance for the structure in terms of a. (c) Si crystallizes in dia-mond structure with 5.430 A Calculate nearest neighbour distance for it​