BRAINCAKEThe Vacuum Photocell
A glass tube that contains a metal plate (photocathode) and a smaller metal electrode (anode).
Light of a frequency greater than the threshold frequency is directed at the photocathode.
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Key terms in this lesson
- Photon
- A discrete packet, or quantum, of electromagnetic energy.
- Threshold frequency
- The minimum frequency of electromagnetic radiation that will cause photoelectric emission from a given metal surface.
More in The Photoelectric Effect
- The Photoelectric Effect
- Explanation of the Photoelectric Effect
- The Stopping Potential
- Planck's Quantum Theory
- Ionisation
- Measuring Ionisation Energy
- Energy of Electrons
- Electron Excitation by Collisions
All 19 lessons in The Photoelectric Effect · All AQA AS-level Physics topics