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diff --git a/506/CH7/EX7.2.a/Example7_2a.sce b/506/CH7/EX7.2.a/Example7_2a.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
+a = 2.7/y;
+x = 2;//distance at which emitter junction is formed in micrometer
+Nb = Nob*erfc(x/a);//boron Profile
+disp('cm^-3',Nb,'Nb=');
+disp('The boron diffusion equation is');
+disp(a,'5*10^18*erfc x / ');
+//At x=2 Np = Nb
+//erfc(2/(2*(D*t)^0.5))=k
+Nop=10^21;
+k = Nb/Nop;
+a = 2/2.7;
+disp('The phosphorous diffusion equation is');
+disp(a,'10^21*erfc x / ');
+
+
+//end
+\ No newline at end of file