The photoelectric effect
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The experiment that challenged the wave model

The experiment that challenged the wave model

Gold-leaf electroscope with negatively charged zinc plate, visible light causing no emission and ultraviolet light ejecting electrons so the leaf falls

The photoelectric effect is the emission of electrons from a metal surface when electromagnetic radiation of high enough frequency hits it. In a gold-leaf electroscope, a negatively charged zinc plate stays unchanged in visible light but discharges rapidly in ultraviolet light.

The photoelectric effect Lesson

  1. A Level
  2. /Physics
  3. /The photoelectric effect