PROBLEM 8 & 9 CH#1 CRYSTAL STRUTURE SOLID STATE PHYSICS BY RK PURI VK BABBER PROBLEMS SOLUTION URDU/HINDI #problem8 calculate the angles which [111] direction of a cube lattice makes with [100] and [110] directions. #problem8 #calculate_the_angles_which_111_direction_of_a_cube_lattice_makes_with_100_and_110_directions . #PROBLEM9 Show (111) and (222) in a unit cubic cell of side a. compute the distance of these planes from a parallel plane passing through the origin. #problem9 #Show_111_and_222_in_a_unit_cubic_cell_of_side_a_compute_the_distance_of_these_planes_from_a_parallel_plane_passing_through_the_origin.