What can we explain with light as a ray, as a wave, and as a particle? Let's whiteboard!
So which one is light, really?
Now I get to blow their minds. None of these models works perfectly. We have to make a kludgy wave-particle hybrid called a photon.
It ends in tears.
But then I made it all better when I said we can energy bar charts (LOL diagrams!) to explain the photoelectric effect. I'll show some whiteboards for that tomorrow.