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diff --git a/728/CH4/EX4.24/Ex4_24.txt b/728/CH4/EX4.24/Ex4_24.txt
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+//Caption:Calculate the breakdown power of circular waveguide
+//Exa:4.24
+clc;
+clear;
+close;
+//Given: 
+d=5;//in cm
+c=3*10^10;//in cm/s
+f=9*10^9;//inHz
+//Dominant mode is TE11:
+wl_o=c/f;
+wl_c=%pi*d/1.841;
+f_c=c/wl_c;
+P_bd_TE11=1790*(d/2)^2*[1-{f_c/f}^2]^0.5;
+disp(P_bd_TE11/1000,'Breakdown power (in kW) =');
+\ No newline at end of file