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+//chapter 6
+//example 6.7
+//Calculate velocity of electron and proton
+//page 148-149
+clear;
+clc;
+//given
+E=10; // in eV (kinetic energy for each electron and proton)
+m_e=9.1E-31; // in Kg (mass of electron)
+m_p=1.67E-27; // in Kg (mass of proton)
+e=1.6E-19; // in C (charge of electron)
+//calculate
+E=E*e; // changing unit from eV to J
+// since E=m*v^2/2
+// therefore  v=sqrt(2E/m)
+v_e=sqrt(2*E/m_e); // calculation of kinetic energy of electron
+printf('\nThe kinetic energy of electron is \tv_e=%1.3E m/s',v_e);
+v_p=sqrt(2*E/m_p); // calculation of kinetic energy of proton
+printf('\nThe kinetic energy of proton is \tv_p=%1.3E m/s',v_p);
+// Note: The answer in the book for both kinetic energy of electron and that of proton is wrong due to calculation mistake