Electromagnetic radiation

  • Thread starter Froglet
  • Start date
  • #1
Froglet
11
0
I recently read an article online stating that electromagnetic radiation is 'a form of energy emitted and absorbed by charged particles'.

This isn't always correct, is it? I mean, I know that charged particles that are accelerating can emit bremsstrahlung and synchrotron radiation, but my own body will emit thermal infra-red, and I'm not made up of charged particles. Also, as I understand it, an atom can emit or absorb e-m radiation simply by electron transitions between energy levels; the atom is still neutral (although it could be in an excited state.)

Am I correct, or hopelessly confused?

Thanks,

Paul.
 

Answers and Replies

  • #2
tiny-tim
Science Advisor
Homework Helper
25,838
255
Hi Paul! :smile:
I recently read an article online stating that electromagnetic radiation is 'a form of energy emitted and absorbed by charged particles'.

… an atom can emit or absorb e-m radiation simply by electron transitions between energy levels

but that is emission by charged particles, isn't it? :confused:
 
  • #3
Froglet
11
0
Hi Paul! :smile:


but that is emission by charged particles, isn't it? :confused:

:rofl: Yes, you're right of course...brain-freeze moment on my part! No further replies necessary!
 
  • #4
gomunkul51
275
0
Basically charges affects other charge solely via EMF (photons).


Roman.
 
  • #5
Khashishi
Science Advisor
2,815
493
Electromagnetic radiation also comes from annihilation of particles, irregardless of charge. I suppose an uncharged black hole also emits EM radiation.
 
  • #6
gomunkul51
275
0
In the annihilation of particles charge is conserved and as far as I know Electromagnetic radiation is still created by Charge (electrons and/or quarks). In a black EM radiation is, as far as I know, created by Charges and escapes the event horizon due to virtual charged particle annihilation...

Cheers.


Roman.
 
  • #7
haruspex
Science Advisor
Homework Helper
Insights Author
Gold Member
38,444
7,958
In the case of thermal radiation from your own body, it would mostly be a result of internal vibrations in polar molecules, such as H2O.
 

Suggested for: Electromagnetic radiation

  • Last Post
Replies
3
Views
2K
  • Last Post
Replies
3
Views
2K
  • Last Post
Replies
5
Views
3K
  • Last Post
Replies
5
Views
2K
  • Last Post
Replies
5
Views
2K
  • Last Post
Replies
3
Views
3K
Replies
17
Views
20K
  • Last Post
Replies
3
Views
1K
Replies
2
Views
606
Replies
6
Views
1K
Top