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+//Example 4_6
+clc;
+clear;
+close;
+format('v',8)
+//given data :
+c=3*10^8;//m/s//Speed of light
+h=1.05*10^-34;//Js//Planks Constant
+mc=0.067;//mo
+mc=mc*0.91*10^-30;//kg
+E=0.3;//eV
+E=E*1.6*10^-19;//J
+//Formula//E=3*h^2*kx^2/2/mc
+kx=sqrt(2*mc*E/3/h^2);//m^-1
+disp(kx,"Smallest k-vector along x-direction(m^-1)");