Problem 4: (2 Mark) The following diffractometer data (expressed as 20) were generated from a specimen irradiated with silver (Ag) Ka radiation: 14.10°; 19.98°; 24.57°; 28.41°; 31.85°; 34.98°; 37.89°; 40.61⁰. (a) Determine the crystal structure. (0.5 Mark) (b) Calculate the lattice constant, a. (0.5 Mark) (c) Assume that the crystal is a pure metal and on the basis of the hard-sphere approximation calculate the atomic radius. (0.5 Mark) (d) At what angle would we find the first reflection if, instead of K radiation, we used silver L radiation to illuminate the specimen? (0.5 Mark)