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diff --git a/3401/CH10/EX10.5/Ex10_5.sce b/3401/CH10/EX10.5/Ex10_5.sce
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+clc
+
+T=300 //K
+k=8.617*10**-5//eV/K
+e=1.6*10**-19 //C
+NB=5*10^16//cm^-3
+NC=2*10^15//cm^-3
+epsilons=11.7
+eps=8.85*10^-14 //V
+ni=1.5*10**10 //cm^-3
+x=0.70*10^-6
+a=9.96*10^-12///solving the equation
+Vbi=((k*T))*log((NB*NC)/ni^2)
+disp(Vbi,"Vbi in V is=")
+
+//for 
+VCB=2 //V
+xdB1=sqrt(a*(Vbi+VCB))
+disp(xdB1,"xdB in meter is=")
+xB1=x-xdB1
+disp(xB1,"xB in meter is=")//        textbook ans are wrong
+
+//for 
+VCB=10 //V
+xdB2=sqrt(a*(Vbi+VCB))
+disp(xdB2,"xdB in meter is=")
+xB2=x-xdB2
+disp(xB2,"xB in meter is=")//        textbook ans are wrong
+