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
0 Comments
Leave a Reply. |