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//Example number 6.2, Page number 116
clc;clear;
close;
//Variable declaration
T=300; //temperature(K)
n=8.5*10**28; //density(per m**3)
rho=1.69*10**-8; //resistivity(ohm/m**3)
e=1.6*10**-19; //charge(c)
m=9.11*10**-31; //mass(kg)
Kb=1.38*10**-23; //boltzmann constant(J/k)
//Calculation
rho=sqrt(3*Kb*m*T)/(n*e**2*rho); //mean free path(m)
//Result
printf("mean free path is %.2e m",rho)
//answer given in the book is wrong
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