Ive heard that fusion occurs at less than 1GeV(lets say that of proton-proton) but what if those same proton-proton collision occur at 2GeV? what will be the result?
I am a plasma scientist working with fusion. Firstly I would like to point out not all fusions of nuclei take the same amount of energy. Secondly diprotons are unstable and do not fuse under normal conditions due to spin-spin interaction. Lastly most fusion reactions occur at much less energy. Lastly doubling the energy would simply, under normal circumstances, just kinetic energy of the resultant particle, however if the raised energy causes other conditions to be met and depending on the fusionable material you could have differing types of decay.
Since E = mc^2, how can photons be massless? If a photon has no mass, then, according to Einstein's formula, its energy is given by E = 0 x c^2, which is 0. Yet, photons do have energy. This seems to be a complete contradiction. Please explain! Thank you.