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+//Example number 9.4, Page number 204
+
+clc;clear;
+close;
+
+//Variable declaration
+RH=3.66*10**-4;     //hall coefficient(m**3/c)
+rho=8.93*10**-3;    //resistivity(m)
+e=1.6*10**-19;     //charge(c)
+//Calculation
+mew=RH/rho;        //mobility(m**2/Vs)
+n=1/(RH*e);      //density of atoms(per m**3)
+//Result
+printf("mobility is %.5f m^2/Vs",mew)
+printf("\n density of atoms is %.1e per m^3",n)
+
+//answer in the book varies due to rounding off errors