if an electron, proton and photon all have a total energy of 1000 MeV which would be traveling the fastest? slowest? Most kinetic energy? Most rest mass?

Question

anonymous · Answer

Photon will always travel at c, so it will be the fastest. Proton will be the slowest because more of its energy will be mass-energy and less will come from motion than the electron. The proton has the most rest mass (photon has zero). Electron will have the most kinetic energy.