Question

The total energy of a proton is three times its rest energy. Find the momentum of the proton in MeV/c units.

Answer 1

We know that the total energy of the proton

Squaring

so

According to the Question E=3moc^2

so

. ..1

here

moc^2 =1.673×10^(-27)×(3×10^8)^2 eV/1.602×10^(-19)

=9.382×10^8eV =938.2 MeV

put in equation 1

p=2653.63 MeV/c answer