//Exa 1.11
clc;
clear;
close;
//given data :
//Formula : Rr=80*%pi^2*(l/lambda)^2
//Given l=lambda/60
//l/lambda=1/60
Rr=80*%pi^2*(1/60)^2;//in Ohm
disp(Rr,"Radiation resistance in Ohm: ");