Is Light Really a Wave?

The photo electric effect shows that light genuinely is a particle. It can be done in real life by shining light on an object hidden inside a black box. When you exceed the threshold frequency, no light gets omittedk round about there. But if you increase the frequency, then you do emission of electrons. The intensity never makes any difference if you're below that threshold frequency. And so what's going on there is, if light was a wave, if it was truly a wave. Now i guess a way to think about this is if you're a swimmer or a surfboard rider, and then you're bobbing up and down as the waves pass,. You don't tend to be