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//Example number 9.6, Page number 205
clc;clear;
close;
//Variable declaration
T1=293; //temperature(K)
T2=305; //temperature(K)
e=1.6*10**-19; //charge(c)
sigma1=2;
sigma2=4.5;
KB=1.38*10**-23; //boltzmann constant
//Calculation
x=((1/T1)-(1/T2));
y=log(sigma2/sigma1);
z=3*log(T2/T1)/2;
Eg=2*KB*(y+z)/(e*x); //energy band gap(eV)
//Result
printf("energy band gap is %.2f eV",Eg)
//answer in the book is wrong
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