Chemistry / Chem 0780 · Atom · ~20 seconds
The Photoelectric Effect
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The photoelectric effect is the ejection of electrons from a metal surface by light, occurring only above a threshold frequency, regardless of brightness.
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Dim violet light ejects electrons from a metal, while bright red light below that metal's threshold frequency ejects none.
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Increasing brightness raises how many electrons are ejected above threshold — it never substitutes for reaching that threshold frequency.