al bl dl Consider a photon, an electron (approximate rest mass 0.5 Meir/c3), and a proton {approximate rest mass=1000 MeV/c') when they each have total kinetic energy 10 eV. Find the momentum and total energy for each particle. For what values of the momentum of the electron is the total energy within a few percent or of the kinetic energy? what about for the proton? Consider a gamma-ray photon of energy 1.0 Mev scattered directly back (in the direction from which it came) by an electron. What are the energy and momentum of the backdscattered photon? How does this change if the gamma ray scatters directly back from a proton? Consider a photon of {almost} visible light of energy 1.0 ev scattered directly forward { in the direction in which it was Originally travelling] by an electron. What are the energy and momentum of the forward-scattered photon