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diff --git a/1697/CH1/EX1.18/Exa1_18.sce b/1697/CH1/EX1.18/Exa1_18.sce
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+//Exa 1.18
+clc;
+clear;
+close;
+//given data :
+f=20;//in MHz
+f=f*10^6;//in Hz
+le=100;//in m
+c=3*10^8;//speed of light in m/s
+lambda=c/f;//in m
+Rr=160*(%pi*le/lambda)^2;//in ohm
+disp(Rr/1000,"Radiation Resistance in KOhm : ");
+\ No newline at end of file