- #1
Julianotcp
- 3
- 0
I know that a black body is an idealized body that absorbs all the incident EM radiation. And I also know that the BB emits a spectrum of thermal radiation that depends on its temperature.
What I cannot understand is the re-emission. For what I've read, when in thermal equilibrium, a BB absorbs and re-emits continuously all the incident radiation. Is that right?
So, when in thermal equilibrium, if a black body absorbs visible light, then why doesn't it re-emit visible light?
What I cannot understand is the re-emission. For what I've read, when in thermal equilibrium, a BB absorbs and re-emits continuously all the incident radiation. Is that right?
So, when in thermal equilibrium, if a black body absorbs visible light, then why doesn't it re-emit visible light?