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+//Example number 6.8, Page number 119
+
+clc;clear;
+close;
+
+//Variable declaration
+rho=10**4;      //density of silver(kg/m**3)
+N=6.02*10**26;    //avagadro number
+e=1.6*10**-19;      //charge(c)
+m=9.1*10**-31;      //mass(kg)
+MA=107.9;     //atomic weight(kg)
+sigma=7*10**7;    //conductivity(per ohm m)
+//Calculation
+n=rho*N/MA;       //density of electrons(per m**3)
+mew=sigma/(n*e*10**2);    //mobility of electrons(m**2/Vs)
+tow=sigma*m*10**15/(n*e**2);    //collision time(n sec)
+//Result
+printf("density of electrons is %.1e m^3",n)
+printf("\n mobility of electrons is %.4e m^2/Vs",mew)
+printf("\n collision time is %.1f sec",tow)