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diff --git a/2453/CH4/EX4.8/4_8.sce b/2453/CH4/EX4.8/4_8.sce
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+//To calculate the temperature
+F_E = 0.01;      //probability in percent
+k = 1.38*10^-23;
+e = 1.6*10^-19;
+//let E-EF be X
+X = 0.5;      //E-EF, eV
+kT = X/(2.303*log10((1-F_E)*100));    //value of kT, eV
+T = kT*e/k;        //temperature, K
+printf("temperature is %d K",T);
+
+//answer given in the book is wrong