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Essay text:
That is, the average energy carried by an ejected (photoelectric) electron should increase with the intensity of the incident light.
In fact, Lenard found that this was not so. Rather, he found the energies of the emitted electrons to be independent of the intensity of the incident radiation.
Einstein (1905) successfully resolved this paradox by proposing that the incident light consisted of individual quanta, called photons, that interacted with the electrons in the metal like discrete particles, rather than as continuous waves. For a given frequency, or 'color,' of the incident radiation, each photon carried the energy E = hf, where h is Planck's constant and f is the frequency...
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