How do smoke detectors work?

Question

I read this [https://www.nrc.gov/reading-rm/doc-collections/fact-sheets/smoke-detectors.html](https://www.nrc.gov/reading-rm/doc-collections/fact-sheets/smoke-detectors.html) but I need help 😛

In: 3

Answer 1

Smoke detectors work by detecting radioactive particles. There’s a little area with a radioactive source, a gap of air, and the detector. As long as the detector receives radioactive particles, the alarm stays silent. Smoke interferes with the particle paths, so the detector doesn’t receive a particle, so it sounds the alarm