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+//Optoelectronics - An Introduction, 2nd Edition by J. Wilson and J.F.B. Hawkes
+//Example 2.1
+//OS=Windows XP sp3
+//Scilab version 5.5.2
+clc;
+clear;
+
+//given - Case(1)
+NA=6e26;//Avagadro's number
+rho=8.93e3;//density of copper in SI Units
+A=63.54;//Atomic mass number of Cu
+e=1.6e-19;//charge of electrons in C
+m=9.1e-31;//rest mass of electrons in kg
+T=2.6e-14;//mean free time between collisions in s
+
+n=NA*rho/A;//number of atoms per unit volume in m^(-3)
+mprintf("n = %.1e m^(-3)",n);
+SigmaCu=n*(e^2)*T/m;//electrical conductivity of Cu in SI Units
+mprintf("\n Sigma of Cu = %.1e (Ohm m)^(-1)",SigmaCu);//The answers vary due to round off error
+
+//given - Case(2)
+ni=1.6e16;//number of holes or electrons per unit volume of intrinsic silicon in m^(-3)
+e=1.6e-19;//charge of electrons in C
+Muc=0.135;//electron mobility in SI Units
+Mun=0.048;//hole mobility in SI Units
+
+SigmaSi=ni*e*(Muc+Mun);//electrical conductivity of Si in SI Units
+mprintf("\n Sigma of Si = %.1e (Ohm m)^(-1)",SigmaSi);