For the nearly free electron model the first Brillouin zone boundary occurs when k = ± π/a , where k is the wavenumber and a the lattice constant. What is the radius of the Fermi surface of sodium as a ratio of the size of the first Brillouin zone in the kx direction in units of π/a? Sodium is monovalent.

For the nearly free electron model the first Brillouin zone boundary occurs when k = ± π/a , where k is the wavenumber and a the lattice constant. What is the radius of the Fermi surface of sodium as a ratio of the size of the first Brillouin zone in the kx direction in units of π/a? Sodium is monovalent.