feb 12, 1887 - Photoelectric Effect
Description:
When a metal is illuminated by an appropriately high-frequency (short) wavelength of light — provided that the threshold frequency, or minimum energy required, is met — electrons are emitted. This emission is instantaneous, counterintuitive to the classical thinking that this process would take a period of time. In addition, once the threshold frequency was met, increasing the energy of the light had no effect on the kinetic energy of the incident electrons.
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