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I think the most important thing to know is that light is acting like a particle or a "stream of photons" in the photoelectric effect and is acting like a wave in diffraction. As long as we have a strong understanding of the behavior of light in those scenarios, I'm thinking we'll be okay for the exams. If they give us another example on a test, I'm sure we could apply what we know from these two experiments to identify the behavior.
To add on, it is just conceptually important to distinguish the difference between the classical mechanics model and quantum mechanics model of light. In the classic mechanics model, light acts as a wave whereas in the quantum mechanics model, light is absorbed and emitted in discrete units (photons). As stated earlier, I think it is sufficient to know and understand the key piece of evidence for each model, which are light diffraction (suggests light is a wave) and the photoelectric effect experiment (suggests light is a photon).
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