If a subatomic particle is moving with an energy equal to 240. mev, what is the frequency associated with this particle ? E=hv where E = energy of the particle, h = planck's constant and v = frequency I thought I would solve this by first converting MeV into joules, and then using the equation E=hv to solve for the frequency. However, it seems that was incorrect :(. Maybe my math was incorrect, but I think I'm missing something. I think because the particle is in motion, velocity may be a factor? I'm not exactly sure. Thanks in advance for your help.