The metal rhodium has an FCC crystal structure. If the angle of diffraction for the $(311)$ set of planes occurs at $2=36\mathrm{.}12($first$-$order reflection, $n=1)$ when monochromatic $x$ radiation having a wavelength of $0\mathrm{.}0711nm$ is used, compute the interplanar spacing for this set of planes.

a$.$ Write the appropriate equation.

b$.$ Rearrange the equation to solve for interplanar spacing.

c$.$ Define the terms in the equation $($write the numbers$).$

d$.$ Calculate the interplanar spacing.