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diff --git a/506/CH7/EX7.2.b/Examle7_2b.sce b/506/CH7/EX7.2.b/Examle7_2b.sce
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+clear;
+clc;
+
+//Caption:Fabrication and Characteristics
+//Given Data
+y = 2.2;//from the figure y=2.2
+Nob = 5*10^18//Uniform Concentration of Boron Profile
+
+//y = 2.7/(2*(D*t)^0.5)
+//2*(D*t)^0.5 = a(let)
+a = 2.7/y;
+x = 2;//distance at which emitter junction is formed in micrometer
+Nb = Nob*erfc(x/a);//boron Profile
+
+//At x=2 Np = Nb
+//erfc(2/(2*(D*t)^0.5))=k
+Nop=10^21;
+k = Nb/Nop;
+a = 2/2.7;
+//Time allowed for diffusion if diffusion of Phosphorous is conducted at 1100 degreeC
+//From the figure D=3.8*10^-13 cm^2/sec
+D=3.8*10^-13//in cm^2/sec
+t = ((a*10^-4)/2)^2*(1/D);
+disp('sec',t,'t=');
+
+//end
+\ No newline at end of file