1. The metal rhodium has an FCC crystal struc- ture. If the angle of diffraction for the (311) set of planes occurs at 36.12° (first-order reflec- tion) when monochromatic x-radiation having a wavelength of 0.0711 nm is used, compute
(a) the interplanar spacing for this set of planes, and (b) the atomic radius for a rhodium atom.
2. The metal niobium has a BCC crystal structure. If the angle of diffraction for the (211) set of planes occurs at 75.99° (first-order reflection) when monochromatic x-radiation having a wavelength of 0.1659 nm is used, compute
(a) the interplanar spacing for this set of planes, and (b) the atomic radius for the niobium atom.