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diff --git a/1655/CH7/EX7.8.1/Example_7_8_1.sce b/1655/CH7/EX7.8.1/Example_7_8_1.sce
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+// Example 7.8.1  page 7.39
+
+clc;
+clear;
+
+w=25d-6;    //width
+v=1d5;      //velocity
+r=40d-6;    //radius
+eps=12.5d-13;
+
+t=w/v;      //computing drift time
+c=eps*3.14*(r)^2/w;     //computing junction capacitance
+c=c*10^16;
+printf("\nDrift time %.1e sec.\nJunction capacitance %.1f pf.",t,c);
+printf("\nCalculation error in the book at the answer of drift time.");
+
+//calculation error in drift time answer in the book is 25*10^-10. it should be 2.5*10^-10.
+
+
+