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It should be photoelectric effect since it showed that light has discrete amount of energies called photons. It showed that no matter how the amplitude changed, the energy was still the same, but when the frequency was changed, the wavelength, it was able to displace electrons.
Yes, photoelectric effect is correct because if light only had wave properties, increasing the amplitude should eject more electrons, but that was not the case as the only thing that increased the amount of electrons ejected was increasing frequency/decreasing wavelength.
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