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//Example number 9.2, Page number 203
clc;clear;
close;
//Variable declaration
e=1.6*10**-19; //charge(c)
ni=1.5*10**16; //particle density(per m**3)
mew_e=0.13; //electron mobility(m**2/Vs)
mew_h=0.048; //hole mobility(m**2/Vs)
ND=10**23; //density(per m**3)
//Calculation
sigma_i=ni*e*(mew_e+mew_h); //conductivity(s)
sigma=ND*mew_e*e; //conductivity(s)
P=ni**2/ND; //equilibrium hole concentration(per m**3)
//Result
printf("conductivity is %.2e s",sigma_i)
printf("\n conductivity is %.3e s",sigma)
printf("\n equilibrium hole concentration is %.2e per m^3",P)
//answer in the book varies due to rounding off errors
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