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+//clear//
+//Example5.3:Finimum acceptable frequency
+//Page 138
+//figure 5.5
+clear;
+clc;
+Rf=20000;      //in Ohms
+Ri=500;         //in Ohms
+f2=50*10^3;        //In Hz
+Anoise=1+(Rf/Ri);
+disp(Anoise,"Anoise");
+funity=Anoise*f2;
+disp("Hz",funity,"funity");
+
+disp("For this application 741 would not be fast enough, therefore 411 would be fine");