5) 30 Marks The figure below shows an X-ray diffraction pattern for pure silver obtained using a powder X-ray diffractometer equipped with Cuka monochromatic radiation having an average wavelength of 0.1542 nm. The diffraction peaks in the pattern have been indexed (as indicated by the (hklabels) and the diffraction angles are listed in the pattern. 160 (111) Peak 20 (111) 38.32 (200 44.60 120 (220) 64.78 (311) 77.69 Intensity 80 (200) 40 (220) (311) ( 40 48 72 80 humimmwww wysunmaya hern 56 20 (Degrees) a) With the aid of a sketch, describe the main components and their arrangement in a powder X- ray diffractometer. With reference to the basic geometry of the instrument, explain how a diffraction pattern is produced from a sample. (10 marks) b) Assuming that silver belongs to the cubic crystal system, which Bravais lattice structure would it have? Justify your answer. (2 marks) c) Explain qualitatively why other diffraction peaks, such as (110), (211), etc., are not evident in the measured XRD pattern of the silver. (3 marks) d) Determine the lattice parameter of the silver. (15 marks)