4. The wave representing an electron moving in the periodic potential field Uk(r - a) = Uk(r), k being a wave vector of the lattice
4. The wave representing an electron moving in the periodic potential field Uk(r - a) = Uk(r), k being a wave vector of the lattice wave function has the form of F-Block function Uk (r) = Uk(r)elkr Show that the density of state g (k) is given by g(k) = k
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