Khan Academy
Khan Academy: Photoelectric Effect
Article explains the experiments on the photoelectric effect and how these experiments led to the idea of light behaving as a particle of energy called a photon.
University of Colorado
University of Colorado: Physics 2000: The Photoelectric Effect
The photoelectric effect is defined and explained. Explanation is insightful and written in an easy to understand language which utilizes an intriguing dialogue between a professor and a teen-age student.
Wikimedia
Wikipedia: Photoelectric Effect
Wikipedia provides excellent information on the photoelectric effect, including it's history, explanations, common uses, and more.
Georgia State University
Georgia State University: Hyper Physics: Photoelectric Effect
Using graphics, words and numbers, the photoelectric effect is described and explained. Planck's theory about quanta of light is explained. Photon energies for the various regions of the EM spectrum are listed. An interactive JavaScript...
Upper Canada District School Board
Tom Stretton's Chemistry Pages: Photoelectric Effects
Deepen your understanding of photoelectric effects with this presentation. Learn about the history and physics of these light concepts.
Georgia State University
Georgia State University: Hyper Physics: Wave Particle Duality
The dualistic nature of light is discussed. The photoelectric effect and the Davisson-Germer experiment are contrasted as empirical evidence supporting each of the two views - particle and wave - of the nature of light. The photoelectric...
Friesian School
Proceedings of the Friesian School/the Quantacized Atom
A very lengthy page from friesian.com discussing Bohr's theory of electronic energy levels and the explanation of commonly observed atomic emission line spectra. The concept of a photon and Einstein's observation of the photoelectric...
Boston University
Modern Physics: Photoelectric Effect Demonstration
A graphical and verbal description of a demonstration which illustrates the phtoelectric effect. Directions, safety precautions, and explanations are provided. Ideally suited as an idea-generator for a student project or lab investigation.
University of Colorado
University of Colorado: Physics 2000: Atom Light Interactions
Discusses the interaction between light energy and atoms of matter. Explains Einstein's photoelectric effect and discusses its application to lasers. Includes an interactive Java applet depicting the interaction between a photon and an...
Science4Fun
Science4 Fun: Albert Einstein
Brief biographical sketch of Albert Einstein, famous scientist whose discoveries include the Theory of Relativity and the photoelectric effect.
National High Magnetic Field Laboratory
Magnet Academy: Robert Millikan
Robert Andrews Millikan was a prominent American physicist who made lasting contributions to both pure science and science education. He is particularly well known for his highly accurate determination of the charge of an electron via...
University of Colorado
University of Colorado: Physics 2000: Quantum Atom: Angular Momentum of an Electron
A very technical explanation of the angular momentum of an electron.
Science Struck
Science Struck: 8 Albert Einstein Inventions That Impacted the World
Describes the refrigerator invented by Einstein and many of his discoveries in physics.
Science Struck
Science Struck: Basics of Quantum Mechanics for Dummies
A good explanation of basic quantum theory.
University of Colorado
University of Colorado: Physics 2000: Planck's Constant and the Energy of a Photon
From the Physics 2000 web site. Planck's theory of quantized energy levels is explained. The concept of a photon is discussed and related to Planck's theory. Explanations are insightful and written in an easy to understand language which...
University of Oregon
University of Oregon: Photons
The University of Oregon provides a definition and detailed chart of the concept of photons, or light quantum.
Wolfram Research
Wolfram Science World: Phillipp Lenard
This site from ScienceWorld mostly describes Lenard's most notable scientific discoveries and contributions. Includes minimal biographical information and links to additional information on related subjects.