What would be the (hkl) indices for the three lowest diffraction-angle peaks for a bcc metal? (b) calculate the diffraction angle (20) for the first three peaks in the diffraction pattern of a-fe powder (which is a bcc metal) using cuka-radiation (2=0.1542nm).

Scientists often deal with numbers that are either very large or very small. for example, the radius of the sun is approximately 696,000 kilometers, while bacterial cells are as small as 1.9 × 10-4 millimeters. express each of these numbers in an alternate form.