For a cubic metal with lattice parameter of 3.92°A, the first four diffraction peaks from the X-ray powder diffraction pattern taken with Cu-Ka radiation (λ = 1.5405°A) occur at 2θ values of 39.7, 46.2, 67.5 and 81.3 degrees. The crystal structure of the metal is

A. decreases B. increases C. remains constant D. shows no systematic variation

A. Burger vector and the dislocation line are Parallel to each other for screw dislocations B. Burger vector and the dislocation line are perpendicular to each other for edge dislocations C. Screw dislocations glide parallel to its Burger vector D. Edge dislocations glide parallel to its Burger Vector

A. 210 B. 220 C. 222 D. 310

A. 18110 B. 18300 C. 19360 D. 19890