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+clc
+//Chapter4
+//Ex_8
+//Given
+e=1.6*10^-19 // in coulombs
+h=6.626*10^-34 //in Js
+me=9.1*10^-31 //in Kg
+d=10.5 // in g/cm
+Mat=107.9 //g/mol
+NA=6.023*10^23 // mol^-1
+E_ctr=5 //in ev
+E_ctr=E_ctr*e // in Joules
+S_band=2*(16*%pi*sqrt(2)/3)*(me/h^2)^(3/2)*(E_ctr)^(3/2)// in states m^-3
+//convesion of units
+S_band=S_band*10^-6 //in states cm^-3
+disp(S_band,"No. of states in the band in states cm^-3 is")
+n_Ag=d*NA/Mat
+disp(n_Ag,"No.of atoms per unit volume in silver in atoms per cm3 is")