Does the wavelength of a photon actually mean wavelength? Because as I understand it, a force field, be it gravity, EM, ect..., has influence at any distance. Theoretically, the field never has an end, reaching out across the whole diameter of the universe, even though the effects would be small. Or is photon wavelength the mathematical value that represents wavelength when describing a photon as a wave. We know how much energy a photon has, therefore if we describe it as a wave, there is a number corresponding to that "wavelength".