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diff --git a/728/CH9/EX9.8/Ex9_8.sce b/728/CH9/EX9.8/Ex9_8.sce
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+//Caption:Calculate the rational frequency & critical velocity of diode.
+//Exa:9.8
+clc;
+clear;
+close;
+v_d=2*10^7;//in cm/s
+L=20*10^-4;//in cm
+f=v_d/L;
+disp(f*10^-9,'Natural frequency (in GHz) =');
+critical_field=3.3*10^3;
+V=L*critical_field;
+disp(V,'Critical voltage (in volts) =');
+\ No newline at end of file