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diff --git a/3636/CH9/EX9.1/Ex9_1.sce b/3636/CH9/EX9.1/Ex9_1.sce
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+clc;
+clear;
+Nd=5*10^16 //in cm^-3
+Na=10^19 //in cm^-3 
+d=1.2*10^-4 //in cm
+e=1.6*10^-19// in J
+epsilon_r=11.7 //in F/cm
+epsilon_0=8.85*10^-14 //in F/cm
+L=18*10^-4 //in cm
+W=80*10^-4 //in micro-W
+myu_n=1350 //in cm^2/V*s
+ni=1.5*10^10 //in cm^3
+VGS=0 //in V
+Const=0.026 //constant for kT/e in V
+
+//Calculation
+Vp=(e*Nd*d^2)/(2*epsilon_r*epsilon_0) //Pitch-off voltage in V
+Ip=(W*myu_n*e^2*Nd^2*d^3)/(epsilon_r*epsilon_0*L) //Pitch-off current in A
+Vbi=Const*log((Na*Nd)/ni^2) //in V
+ID=Ip*(1/3-((VGS+Vbi)/Vp)+(2/3)*((VGS+Vbi)/Vp)^3/2)
+
+mprintf("a) Pitch-off voltage= %1.1f V\n",Vp)
+mprintf("b) Pitch-off current= %.3e A\n",Ip)
+mprintf("c) Drain current at pinch-off= %.2e A",ID) //The answers vary dueto round off error