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+clear;
+clc;
+printf("\nEx-6.24\n");
+//page no.-195
+//given
+rho=1.73*10^-8;......//resistivity in ohm m
+M=63.5;...........//atomic weight
+d=8.92*10^3;......//density in Kg/m^3
+N=6.023*10^23;......//avagadro no.
+e=1.6*10^-19;.......//charge
+m=9.11*10^-31;......//mass of e
+
+no=(N*d)/M........//no of electrons per unit volume
+
+printf("\nno. of electrons/ unit volume 8.463*10^25 /m^3\n");
+
+mu=1/(rho*no*e).........//mobility
+
+printf("\nmobility is 4.1145 m^2/Vs\n");
+
+tau=m/(no*e^2*rho)..........//relaxation time
+
+printf("\nrelaxation time is 2.25*10^-11 s");