Radius of the fermi sphere

by ehrenfest
Tags: fermi, radius, solved, sphere
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 P: 1,996 1. The problem statement, all variables and given/known data On page 249 of ISSP, Kittel says that the radius of a free electron Fermi sphere is $$k_F = \left(3 \pi^2 n \right)^{1/3}$$ where n is the concentration of electrons. I don't know why that is true. EDIT: never mind; they derive that on page 138 2. Relevant equations 3. The attempt at a solution
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