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: Physics
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.