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Regarding the experiment in which long wavelength light does not eject electrons from a metal surface even with the increased intensity of the light, if it tells us that light not only has wavelike properties, then what other properties does it have?
When electrons weren't ejected when the intensity (corresponding to amplitude for the wave model of light) was increased, they realized light wasn't acting like a wave. Increasing the intensity should've meant the wave had more energy. However, even using a light with low intensity caused electrons to be ejected as the change was an increased frequency. This indicates that light exists also as "packets of energy," or in a quantized value of a photon.
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