n. electricity produced by the influence of light.

In other words, when a photon strikes a surface, ( usually some kind of metal in the examples I have read ) sometimes it is of the right frequency to dislodge an electron from the atom. The charged particle can be collected by a magnetic pole, where it essentially becomes electricity. Einstien formulated the basic theory that covers this: it became the foundation for modern quantum physics.

Intrestingly, the amount of electrons produced does not increase with the intensity of light. Einstein found that only the wavelength of the photons mattered.

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