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+// Ex12_1 Page:243 (2014)
+clc; clear;
+E_F = 8;    // Fermi energy, eV
+E0_bar = 3/5*E_F;   // Average kinetic energy of a free electron gas at 0K
+e = 1.6E-019;   // Energy equivalent of 1 eV, J
+m = 9.1E-031;   // Mass of an electron, kg
+v = sqrt(2*E0_bar*e/m); // Speed of the electron, m/s
+printf("\nThe speed of the electron at its mean energy at 0K = %3.1e m/s", v);
+
+// Result
+// The speed of the electron at its mean energy at 0K = 1.3e+06 m/s