125 - Photons

In this video Paul Andersen explains how light travels in photons which can be described as both particles and waves. Einstein showed that photons can be described as particles using the photoelectric effect to show that the energy of a photon is related to the frequency and Planck's constant. The quantized nature of light can be found in both spectral lines and the photoelectric effect.

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Music Attribution
Title: String Theory
Artist: Herman Jolly

All of the images are licensed under creative commons and public domain licensing:

“Albert Einstein.” Wikipedia, the Free Encyclopedia, May 1, 2015.
“Electromagnetic Radiation.” Wikipedia, the Free Encyclopedia, May 2, 2015.
English: Colorful Spectrum simulationEspañol: Espectro de Colores de La Luz visibleEsperanto: Koloroj Videblaj中文(简体)‎: 软件模拟的可见光谱。中文(繁體)‎: 軟件模擬的可見光譜。, August 27, 2008. Digitally created by Deborah S Krolls, December 13, 2004.
Esquembre, Lookang many thanks to Fu-Kwun Hwang and author of Easy Java Simulation = Francisco. English: Electromagnetic Waves Can Be Imagined as a Self-Propagating Transverse Oscillating Wave of Electric and Magnetic Fields. This Diagram Shows a Plane Linearly Polarized Wave Propagating from Left to Right. The Electric Field Is in a Vertical Plane and the Magnetic Field in a Horizontal Plane., October 5, 2011. Own work.
“Gas-Filled Tube.” Wikipedia, the Free Encyclopedia, January 31, 2015.
Grobe, Hannes. English: Portable UV (ultraviolett) Lamp with UV-A and UV-B Light, August 8, 2011. Own work.
Kurzon. English: A Simple Illustration of Bohr’s Model of the Atom, with an Electron Making Quantum Leaps., April 14, 2014. Own work.
“Photon.” Wikipedia, the Free Encyclopedia, May 1, 2015.
Torindkflt. Demonstration of a Touch-Activated Table Lamp, December 23, 2007. Own work."