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+//chapter 5 example 1 pg no-227
+//=============================================================================
+clc;
+clear;
+//Given Data
+F     =  2*10^9;//reflex klystron operating frequency
+Vr    =  2000;//Repeller voltage
+Va    =  500;//Accelarating voltage
+n     =  1;//integer corresponding to mode
+e     =  1.6*10^-19;//charge of electron
+m     =  9.1*10^-31;//mass of electron in kg
+s     =  2*10^-2;//space b/w exit of gap and repeller electrode
+dVr1  = 2;//(change in Vr in percentage
+//Calculations
+dVr   = dVr1*Vr/100;//conversion from percentage to decimal
+//dVr/df = ((2*pi*s)/((2*pi*n)-pi/2))*sqrt(8*m*Va/e));
+//let df = dVr/((2*pi*s)/((2*pi*n)-pi/2))*sqrt(8*m*Va/e));
+
+df       =  (dVr)/((2*%pi*s)/((2*%pi*n)-(%pi/2))*sqrt(8*m*Va/e));//change in freq as a fun of repeller voltage
+
+
+//Output
+mprintf('Change in frequency is %3.0f MHz',df/10^6);
+
+//=============================================================================