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The photoelectric effect- when monochromatic light of sufficient energy hits the metal plate, an electric current flows.
1. Presence of a threshold frequency. Light shining on the metal must have a minimum frequency (which varies with the metal), or no current flows.
2. Absence of a time lag. Current flows the moment that light of high enough frequency shines on the metal, regardless of its intensity.
Concept 7-4. How the photon theory explains the photoelectric effect; the relation between photon absorbed and electron released
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