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+//chapter 5 example 5 
+//=============================================================================
+clc;
+clear;
+//Given Data
+F     =  1*10^9;//two cavity klystron operating frequency
+Va    =  2500;//Accelarating voltage in volts
+e     =  1.6*10^-19;//charge of electron
+m     =  9.1*10^-31;//mass of electron in kg
+s     =  0.1*10^-2;//input cavity space
+//Calculations
+
+u     = sqrt((2*e*Va)/m);//velocity at which electron beam enters the gap
+T     = s/u ;//Time spent in the gap
+f     = T*F;//number of cycles
+
+//Output
+mprintf('Number of cycles that elase during transit of beam through input gap is %3.3f cycle',f);
+
+//=============================================================================