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+//=====================================================================================
+//Chapter 16 example 4
+
+clc;clear all;
+
+//variable declaration
+Va  = 2000;   //accelerating voltage in V
+e    = 1.6*10^-19;      //charge of electron in C
+m    = 9.1*10^-31;      //mass of electron in kg
+l    = 0.015;    //length of plates in m
+d    = 0.005;    //distance between plates in m
+S    = 0.5;      //the distance between the screen and centre of plates in m
+
+//calcuations
+V    = sqrt(2*Va*(e/m));    //beam speed in m/s
+Sd    = (l*S)/(2*d*Va);            //deflection sensitivity of the tube in mm/V
+D     = 1/(Sd);            //defelection factor in V/mm
+
+//result
+mprintf("Beam speed  = %3.3e m/s",V);
+mprintf("\ndeflection sensitivity of the tube %3.3f mm/V",(Sd*10^3));
+mprintf("\ndefelcction factor = %3.4f V/mm",(D*10^-3));
+