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+// Chapter 3 example 13
+//------------------------------------------------------------------------------
+clc;
+clear;
+// Given data
+f   = 1*10^9;       // frequency in Hz
+a   = 5*10^-2;      // wall separation
+c   = 3*10^8;       // velocity of EM wave in m/s
+m   = 1;            // for TE10
+n   = 0;            // for TE10
+
+// Calculations
+// lamda0   = 2/sqrt((m/a)^2 + (n/b)^2)
+lamda0      = (2*a)/m
+lamda_frspc = c/f;
+if lamda_frspc > lamda0 then
+    mprintf('1 Ghz signal cannot propagate in TE10 mode')
+else
+    mprintf('1 Ghz signal can propagate in TE10 mode');
+end
+    
+    
+