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+//Example 4_10
+clc;
+clear;
+close;
+format('v',7)
+//given data : 
+h=1.05*10^-34;//Js//Planks Constant
+mc=0.067;//mo
+mc=mc*0.91*10^-30;//kg
+n0=10^18;//cm^-3
+n0=n0*10^6;//m^-3
+EF=(h^2/2/mc)*(3*%pi^2*n0)^(2/3);//J
+EF=EF/(1.6*10^-19);//eV
+disp(EF,"Position of fermi level(eV)");
+//Answer given in the textbook is wrong