SKEDSOFT

when so, the Kinetic Energy  . Thus the kinetic energy approaches the classical limit for

                       
                        ------------(9)
                        Total energy   =   Kinetic energy      Rest mass energy.
Where is the total energy. The first term in the right hand side arises due to external work done on the particle and the second term is due to rest mass energy.

The total energy equation can also be written in the form of linear momentum.
                                
                                               ................................    (11)

From equation (10) and (11),
                         
                           

             . . . . . . .  . . . . . . . . . . . . .      ( 12 )
Equation (12) is another form of total energy. For massless particles such as neutrino, etc the total energy