clear;
clc;
printf("\nEx-6.17\n");
//page no.-191
//given
rho=1.54*10^-8;......//resistivity in ohm m
no=5.8*10^28;.........//no of free electrons per unit vol
m=9.11*10^-31;....//mass
e=1.6*10^-19;......//charge in C

tau=m/(no*e^2*rho)....//relaxation time

printf("\nrelaxation time is 3.97*10^-14 s\n");