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+// Scilab Code Ex4.1: Page-112 (2006)
+clc; clear;
+m = 9.1e-031;   // Mass of an electron, kg
+e = 1.6e-019;   // Charge on an electron, C
+n = 8.5e+028;   // Concentration of electron in Cu, per metre cube
+rho = 1.7e-08;  // Resistivity of Cu, ohm-m
+t = m/(n*e^2*rho);  // Collision time for an electron in monovalent Cu, s
+printf("\nThe collision time for an electron in monovalent Cu = %3.1e s", t);
+
+// Result 
+// The collision time for an electron in monovalent Cu = 2.5e-014 s