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diff --git a/3020/CH18/EX18.12/ex18_12.sce b/3020/CH18/EX18.12/ex18_12.sce
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+clc;
+clear all;
+Eg=1;//bandgap in eV
+//let me/mh=x
+x=4;//given me/mh value 
+k=1.38e-23;//boltzman constant
+//formula is Ef=(Eg/2)+(3*k*T/4)*log(mh/me) fermi level
+//and Ef=Ev+0.5eV so.. 
+//(Ev+0.5)*1.6e-19=(Ec+Ev)/2
+//at temperature T , (Ev+0.5)*1.6e-19=((3*k*T)/4)*logx
+//so.. 1.6e-19=(3*k*T)/log(x)
+//so.. T=4*1.6e-19/(3*k*log(x))
+T=(4*0.16e-19)/(3*k*log10(x));//temperature at which fermi level is shifted to 10%
+disp('K',T,'temperature at which fermi level is shifted to 10% is:')
+// Wrong answer printed in textbook... checked in calculator also