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// Scilab Code Ex4.7: Page-121 (2006)
clc; clear;
h = 6.625e-034; // Planck's constant, Js
h_cross = h/(2*%pi); // Reduced Planck's constant, Js
m = 9.11e-031; // Mass of an electron, kg
e = 1.6e-019; // Energy equivalent of 1 eV, J/eV
V = 1e-05; // Volume of cubical box, metre cube
E_F = 5*e; // Fermi energy, J
D_EF = V/(2*%pi^2)*(2*m/h_cross^2)^(3/2)*E_F^(1/2)*e; // Density of states at Fermi energy, states/eV
printf("\nThe density of states at Fermi energy = %4.2e states/eV", D_EF);
// Result
// The density of states at Fermi energy = 1.52e+023 states/eV
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