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+//Exa 2.15.2
+clc;
+clear;
+close;
+// Given data
+N_c = 2.8 * 10^19;// in cm^-3
+del_E = 0.25;// fermi energy in eV
+KT = 0.0259;
+f_F = exp(-(del_E)/KT);
+disp(f_F,"The probbaility in the condition band is occupied by an electron is ");
+n_o = N_c * exp(-(del_E)/KT);// in cm^-3
+disp(n_o,"The thermal equilibrium electron concentration in cm^-3 is");
+