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I think the important takeaway is that light has both the properties of a wave and a particle/photon, depending on the situation. The photoelectric experiment showed that light cannot eject electrons without the correct frequency, showing that it doesn't act like a wave, because if it always acted like a wave an increase in intensity would've been sufficient to eject the electrons from the metal surface, which it wasn't However, in the diffraction experiment, light was canceled out by its own interfering waves, showing it also has wavelike properties.
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