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//Ex:5.11
clc;
clear;
close;
u=0.75;// refractive index
f=10*10^6;// frequency in Hz
fmuf=12*10^6;// frequency in Hz
h=350;// height in km
Nmax=((1-u^2)*f^2)/81;
fc=9*sqrt(Nmax);// frequency in Hz
Ds=(2*h)*(sqrt((fmuf/fc)^2-1));// range in km
printf("The range = %f km", Ds);
printf("\n The ans is wronge in the given textbook");
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