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+clc;
+clear all;
+n = 5.8e28; // Number of electrons per unit volume
+tr = 3.4e-14; // Relaxation time of electron in seconds
+m = 9.11e-31; // Mass of electron in Kg
+e = 1.6e-19; // Charge of an electron
+rho = m/(n*e^2*tr); //Electrical resistivity of sodium metal
+disp('Ohm.meter',rho,'Electrical resistivity of sodium metal at zero degrees is')
+ue = (e*tr)/m; //Mobility of electron in metal
+disp('m^2/(V.s)',ue,'The mobility of electron in metal is')
+// Wrong answer printed in textbook... checked in calculator