clear    
clc
disp('Exa-8.2(a)');
EKa=21.990;EKb=25.145;EK=25.514                                      //all the values are in KeV
ELo=EKb-EKa;printf('The enrgy of La of X-ray is %.3fKeV.\n',ELo);             //Energy of La X-ray
disp('Exa-8.2(b)');
EL=-EK+EKa;printf('Hence the binding energy of the L electon is %.3fKeV.',EL); // for electron L electron