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+clc
+//Chapter5
+//Ex_1
+//Given
+e=1.6*10^-19 // in coulombs
+h=6.6*10^-34 //in J s
+m=9.1*10^-31 //in Kg
+me=1.08*m
+mh=0.56*m
+T=300 //in Kelvin
+Eg=1.10 // in eV
+ue=1350//in cm2/V/s
+uh=450//in cm2/V/s
+k=1.38*10^-23 //m2 kg s-2 K-1
+Nc=2*((2*%pi*me*k*T)/h^2)^(3/2) //in m^-3
+Nc=Nc*10^-6 //in cm^-3
+Nv=2*((2*%pi*mh*k*T)/h^2)^(3/2) //in m^-3
+Nv=Nv*10^-6 //in cm^-3
+ni=sqrt(Nc*Nv)*exp(-Eg*e/(2*k*T))
+disp(ni,"Intrinsic concentration of Si in cm^-3 is")
+sigma=e*ni*(ue+uh)
+p=1/sigma
+disp(p,"Intrinsic resistivity of Si in ohm cm is")