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+//Chapter 11 : Free Electron Theory Of Metals
+
+clear;
+
+//Variable declaration
+sigma=6.8*10**7        //conductivity
+n=8.5*10**28           //number of electrons
+m=9.1*10**-31          //Mass of electron
+e=1.6*10**-19          //charge on electron
+k=1.38*10**-23         //Boltzmann's constant in J/K
+T=300                  //temperature in K
+
+//Calculations
+lamda=(2*sigma*sqrt(3*m*k*T))/(n*e**2)/10**-9
+
+//Result
+mprintf("Mean free path for electron= %1.1f*10**-9 m",lamda)