Happy Physics Land gave an excellent answer but here's my take on how to answer the question if it was in an exam.
Hey there, to my knowledge I don't know any links between stopping voltage and the emission of light. I think how stopping voltage works is that, its the voltage at which electrons with max KE cannot reach the electrode and as for the first part, I don't think there is a relevance between wave reflections and the photoelectric effect.
If someone knows more, then I want to hear a better explanation but I don't think it's completely valid.
Moderator action: Merged double post. You can edit and include multiple quotes in the same post.
Just quickly, there IS a relationship between the quantisation of light and stopping voltage, although I don't remember how much you needed (if any) to know in the HSC. Basically, there were three key points that suggested the photoelectric effect was caused by a "particle" like light, rather than a wave.
1. Stopping voltageIf light were a wave, there wouldn't be a minimum frequency (ie. work function) for which electrons would be ejected. We know that the energy of a wave is proportional to the square if its amplitude (don't worry about this, not important). But what that means it that, if light were a wave, if would CONTINUOUSLY add energy to the electron (as more amplitudes pass through the electron) until, eventually, it should have enough energy to jump off the surface of the metal. This doesn't happen: you can shine light at a low enough frequency for as long as you want onto a surface, and if it below the work function nothing will happen. Therefore, stopping voltage is related to the photoelectric effect, and it's explanation.
2. Time delayThis is a similar point as above; the only time delay between the light being switched on and the electrons jumping off was the distance between the light and the surface, divided by the speed of light (ie. the light had to GET to the surface, but after that the electrons jumped off instantly). Again, this is indicative of the particle nature of light (think all or nothing principle, rather than a gradual build up).
Frequency, not intensity, dependentThis one is straight from the course, so I'll assume you understand this!
If you want a super comprehensive, impressive answer, you could always just cite the three things talked about above. Nice to understand them though
Jake