When people say about wave-like nature of a photon, what do they mean:
- Pressure-like wavefront - it moves as a sphere (or a bulge on a surface) and then if we measure pressure at one single point (after the front moved further) - it will raise and fall "drawing" a wave.
- Something like an arrow - it moves in the space, but it also has internal vibrations. Different points of it have different curvature.
- Something that just moves along one axis, but also moves up-and-down along the other axis.
- Something else?
Option #1 means the photon itself doesn't "know" anything about waves - the wave is the impact that was left after it. Option #2 and #3 mean that crests/troughs are intrinsic to the photon.
