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//Example number 9.7, Page number 205
clc;clear;
close;
//Variable declaration
e=1.6*10**-19; //charge(c)
mew_e=0.19; //electron mobility(m**2/Vs)
T=300; //temperature(K)
KB=1.38*10**-23; //boltzmann constant
//Calculation
Dn=mew_e*KB*T/e; //diffusion coefficient(m**2/sec)
//Result
printf("diffusion coefficient is %.1e m^2/s",Dn)
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