a) The atomic weight per 1mol of copper with face-centered cubic structure and the density at 298 K are 63.54g and 8.89106g/m3 respectively. A) Estimate the nearest-neighbor distance of Cu atoms. (10 pts) b) If we want to measure the diffraction from planes separated by this nearest-neighbor distance, at what angle should we expect to observe the Bragg angle? Assume lambda = Mo-K alpha x-rays. (10 pts) c) Calculate the energy of the x-rays mentioned in part b) (10 pts)