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+// Exa 2.19
+clc;
+clear;
+close;
+// given : E=5*sin(10^8*t+4*x)az // equation of electric field 
+A=5 // amplitude of the electric field
+omega=10^8 // angular frequency in radians/sec
+f=omega/(2*%pi) // frequency in Hz
+Beta=4 // phase constant in rad/m
+v_0=3*10^8 // speed of light in m/s
+lambda=v_0/f // wavelength in m
+disp(f/10^6,"frequency in MHz:")
+disp(Beta,"phase constant in rad/m:")
+disp(lambda,"wavelength in m:")