Electromagnetic Radiation From Metal
Most recent answer: 06/11/2013
- Ankit (age 17)
Sagar,mp, India
Actually, it does happen. Think of a hot piece of metal, say in an electric heater. You can see it glow. That's the electromagnetic radiation from it. At room temperature, there's almost no visible light emitted, just infrared and lower frequencies. The emitted radiation is then just balanced by absorbed radiation coming from the room.
The part of this story that would not make sense in a classical picture of radiation from accelerating classical charges is the way the frequency spectrum of the emitted light depends on temperature. This problem was the first motivation for Planck's proposal in 1900 that the radiation came in lumps of energy of size E=hf, where f is frequency and h has come to be called Planck's constant. That proposal was the first window into an entirely new way of seeing all the ingredients of the world, quantum mechanics.
Mike W.
(published on 06/11/2013)