Einstein showed that these results can be explained by two assumptions: (1) that light is composed of corpuscles or photons, the energy of which is given by Planck’s relationship, and (2) that an atom in the metal can absorb either a whole photon or nothing. Furthermore, emission takes place as soon as the light shines on the surface there is no detectable delay. ![]() The kinetic energy of the emitted electrons depends on the frequency ν of the radiation, not on its intensity for a given metal, there is a threshold frequency ν 0 below which no electrons are emitted. In 1905 Einstein extended Planck’s hypothesis to explain the photoelectric effect, which is the emission of electrons by a metal surface when it is irradiated by light or more-energetic photons. Photoelectric effect: Einstein's Nobel Prize-winning discovery See all videos for this article
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