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  1. Magnetic Field | Week 1
    4 Topics
  2. Electromagnetic Field
    4 Topics
  3. Electromagnetic Induction
    6 Topics
  4. The Transformer
    5 Topics
  5. Simple A.C Circuit
    4 Topics
  6. Models of the Atom
    2 Topics
  7. Radioactivity
    3 Topics
  8. Half Life
    8 Topics
  9. Energy Quantization
    3 Topics
  10. Photoelectric Effect
    4 Topics
  11. Wave Particle Paradox
    3 Topics

Lesson 10, Topic 1
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Photoelectric Effect

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When light falls on certain metal surfaces, electrons are emitted. This is known as photoelectric effect. Photoelectric emission is the giving off of electrons from a metal surface when light of appropriate frequency falls on the surface of the metal.

Findings show that the maximum kinetic energy of emitted electrons is directly proportional to its frequency or wavelength when maximum energy is plotted against frequency of incident light for a given metal.

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Screen Shot 2020 10 30 at 2.16.19 AM

The higher the frequency, the faster electrons are removed from the metal.

Threshold frequency: This is the minimum frequency of an incident light needed to remove an electron from a metal surface.


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