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diff --git a/25/CH4/EX4.3/4_3.sce b/25/CH4/EX4.3/4_3.sce
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+//example:-4.3,page no.-167.
+//program to find out the highest usable frequency.
+a=0.000889;b=0.0029464;eipsilar=2.2;c=3*10^8;
+// here (b/a)=3.3,so for this kc*a=0.47
+kc=0.47/a;
+fc=(c*kc)/(2*%pi*sqrt(eipsilar))
+fc=fc/(10^9);
+fmax=0.95*fc;
+disp(fmax,'maximum usable frequency in GHZ=')
+\ No newline at end of file