system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Why do radio waves pass through walls while light waves don't?
gpt
Waves tend to interact with things that have a similar scale to their wavelength. A solid, opaque object like a wall has microstructures that are of a similar size to the wavelength of light (i.e. very, very small - nanometre to micrometre scale) so it interacts strongly with visible light and therefore blocks it. But the wavelength of a radiowave is much greater, often measured in metres, so it doesn't interact anywhere near as much with materials that would block visible light.