Physics
Compton Scattering
Quick fact
Arthur Compton’s 1923 experiment showed that light behaves like a particle when it collides with an electron, earning him the Nobel Prize in Physics in 1927 and forever changing our understanding of electromagnetic radiation.
Why this is interesting
You've seen X-ray images, but did you know that when X-rays hit matter, some photons come out with lower energy? Why does that happen, and what does it tell us about the nature of light?