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+//Example number 6.5, Page number 117
+
+clc;clear;
+close;
+
+//Variable declaration
+d=8.92*10**3;     //density(kg/m**3)
+rho=1.73*10**-8;    //resistivity(ohm m)
+M=63.5;    //atomic weight
+N=6.02*10**26;    //avagadro number
+e=1.6*10**-19;      //charge(c)
+m=9.1*10**-31;      //mass(kg)
+//Calculation
+n=d*N/M;
+mew=1/(rho*n*e);      //mobility(m/Vs)
+tow=m/(n*e**2*rho);   //average time(sec)
+//Result
+printf("mobility is %.3e m/Vs",mew)
+printf("\n average time is %.2e sec",tow)