Physics
Bragg’s law and Brillouin zones: a visual guide
How X-rays reveal the inside of a crystal, and why physicists draw strange polyhedra called Brillouin zones to understand it.
Blog
Articles on physics, science teaching and the ideas behind our simulations.
Articles
Physics
Why some waves pass through walls and others don’t
Reflection, absorption and transmission: what decides how much of a wave makes it through a wall, a window or a sheet of metal.
Physics
The Doppler effect, explained with an interactive simulation
Why a passing siren changes pitch, how to calculate the shift, and what happens when a source outruns its own sound.