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diff --git a/3446/CH3/EX3.1/Ex3_1.sce b/3446/CH3/EX3.1/Ex3_1.sce
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+// Exa 3.1
+// To determine free space and reflected surface attenuations.
+
+clc;
+clear all;
+
+hb=100; //in feets(height of BS antenna)
+hm=5;  // in feets(height of mobile antenna)
+f=881.52;//in MHz
+lamda=1.116;  //in feet
+d=5000;  //in feet
+Gb=10^0.8;  //8dB(BS antenna gain)
+Gm=10^0;   // 0dB (Mobile antenna gain)
+
+//solution
+free_atten=(4*%pi*d/lamda)^2*(Gb*Gm)^-1;
+y=round(10*log10(free_atten));
+printf('Free space attenuation is %d dB \n',y);
+reflect_atten= (d^4/(hb*hm)^2)*(Gb*Gm)^-1;
+x=round(10*log10(reflect_atten));
+printf(' Reflecting surface attenuation is %d dB \n ',x);