# Physics

An assortment of topics from physics

This demo tests your understanding of light | Barber pole, part 1How shining polarized light through sugar water results in colored diagonal stripesSep 1, 2023

The origin of light, scattering, and polarization | Barber pole, part 2How light can be described by a force due to the delayed effect of an accelerating charge, and how it can be used to explain the demo from the previous lesson.Aug 31, 2023

Some light quantum mechanics (with minutephysics)An introduction to the quantum behavior of light, specifically the polarization of light. The emphasis is on how many ideas that seem "quantumly weird" are actually just wave mechanics, applicable in a lot of classical physics.Sep 13, 2017

Feynman's Lost Lecture (ft. 3Blue1Brown)This video recounts a lecture by Richard Feynman giving an elementary demonstration of why planets orbit in ellipses. See the excellent book by Judith and David Goodstein, "Feynman's lost lecture”, for the full story behind this lecture, and a deeper dive into its content.Jul 20, 2018

The Brachistochrone, with Steven StrogatzA classic problem that Johann Bernoulli posed to famous mathematicians of his time, such as Newton, and how Bernoulli found an incredibly clever solution using properties of light.Apr 1, 2016

Snell's law proof using springsA clever mechanical proof of Snell's law.Apr 1, 2016

Why 5/3 is a fundamental constant for turbulenceA look at what turbulence is (in fluid flow), and a result by Kolmogorov regarding the energy cascade of turbulence.Nov 7, 2018