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Q4. (9 marks total) X-ray diffraction. Table 1 lists the 2 Bragg angles for the first three peaks (first-order) of a X-ray diffraction pattern for an unknown metal powder sample. The wavelength of the X-ray used was 0.15418nm. Beware of the forbidden reflections! (a) Determine whether this metal has a BCC or FCC crystal structure. Show all work. (6 marks) (b) Based on your response in (a), estimate which metal was tested ( 3 marks). Table 1. Diffraction angles of the first 3 peaks in the X-rav nattern. 3 CME/ME 261: Materials for Manufacturing January 27,2023