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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