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+//chapter 6
+//example 6.3
+//Calculate relaxation time of conduction electrons
+//page 147
+clear;
+clc;
+//given
+n=5.8E28; // in 1/m^3 (density of electron)
+m=9.1E-31; // in Kg (mass of electron)
+e=1.6E-19; // in C (charge of electron)
+p=1.54E-8; // in ohm-m (resistivity)
+//calculate
+t=m/(n*e^2*p); // calculation of relaxation time
+printf('\nThe relaxation time of conduction electrons is %1.2E sec',t);