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//Example number 9.10, Page number 207
clc;clear;
close;
//Variable declaration
Eg=1.9224*10**-19; //energy gap of semiconductor(J)
T1=600; //temperature(K)
T2=300; //temperature(K)
x=-1.666*10**-3;
KB=1.38*10**-23; //boltzmann constant
//Calculation
T=(1/T1)-(1/T2);
r=exp(x*(-Eg/(2*KB))); //ratio between conductivity
//Result
printf("ratio between conductivity is %.3e",r)
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