# Light is only a photon - no wave by feynamn?

by jd12345
Tags: feynamn, light, photon, wave
 P: 3,014 Light is only a photon - no wave by feynamn? I should further add that the photon is a massless particle, i.e. it is always ultra-relativistic. One consequence of this is that one cannot ascribe a position as an observable for the photon. The role of a wave-function is given to a field operator that creates/annihilates a photon at a particular space-time point. Mathematically, this field operator coincidences with the 4-potential $A^\mu(x)$. As for classical waves, such as radio-waves emitted from an antenna, they are best described by so called coherent states.