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+// Example 8.9, page no-214
+clear
+clc
+n=18.1*10^28//per cubic m
+h=6.62*10^-34//Js
+m=9.1*10^-31//Kg
+e=1.6*10^-19//C
+ef=((3*n/(8*%pi))^(2/3))*((h^2)/(2*m))
+ef=ef/e
+printf("The Fermi energy at 0 K is %.2f eV ",ef)