Radio wave photons and light photons have a different wavelength. But they also appear to have a much different "thickness" in that light photons "fit" cleanly through small pigeonholes, where the corresponding radio wave would interact with its border.
So the two kinds of radiation don't seem to only differ in wavelength as such - a property that is much more subtle - but also in it's "diameter" (the extent of possible interaction orthogonal to their travelling direction).
If that is correct so far, I wonder why that isn't spelled out in introductory textbooks more often - it seems to be the much more intuitively understandable concept than the wavelength.
If that is true, my next question would be if that extent is the same, or roughly the same, as the quantum-mechanical wave-function: I.e, does the space with a reasonable probability to "find the particle" in (not that I have yet fully understood what that means) spread around the line of traveling more for lower-frequency particles?
If that is also true, does that not mean that the general idea of elementary particles as sub-microscopical is flawed in that particles are really entities of any size - in particular including macroscopic sizes?