# What particle emits the most radio waves?

1. Feb 5, 2015

### S3nkaku

I'm operating with the understanding that everything emits radio waves (electromagnetic/light waves). Is this correct? Whatever the answer is, what particle or element or molecule emits the most/greatest radio waves?

2. Feb 5, 2015

### Staff: Mentor

All accelerated charges emit electromagnetic waves. The frequency spectrum of those depends on details of the process.
That depends on how you accelerate the particles / the charges in the object. There is no intrinsic particle property "emits more/less electromagnetic waves" apart from the charge of the particle.

3. Feb 5, 2015

### Staff: Mentor

Objects in the universe emit very little radio waves compared with the rest of the spectrum. The reason for this is that the energy per photon of a radio wave is very, very low. Most EM generating processes take place well above this energy range. For example, even the thermal radiation of an object at 4 kelvin peaks far above the frequency of radio waves. (It peaks at 414 GHz actually)

4. Feb 6, 2015

### blue_leaf77

By energy per photon, do you mean the one corresponding to $\hbar \omega$? If yes what does it have to do with the weak magnitude of the spectrum in microwave region?

5. Feb 6, 2015

### Staff: Mentor

Perhaps I shouldn't say that the reason is that the energy per photon increases. I thought it made sense when I wrote it, but now I don't know.

6. Mar 6, 2015

### tech99

Radio waves and EM waves generally are emitted when a charged particle is accelerated. So electrons are the best radiators because they have least mass and are most easily accelerated.

7. Mar 6, 2015

### Blackberg

A radio wave has a frequency, an amplitude, energy, and momentum. We could also describe whether it is plane, cylidrical or spherical (or else), and find out about polarisation, coherence, and uncertainty.

I'm unsure however as how we would count them or measure their "greatness".

8. Mar 7, 2015

### blue_leaf77

Naturally that would mean the strongest power in its emitter spectrum.