1. Jun 21, 2004

I read the book, "ABOUT TIME" by Paul Davies and I forgot how particles getting sucked into a black hole convert some of their mass in high energy radiation such as x rays and gamma radiation. I am not referring to Hawking radiation that holds up the second law of thermodynamics but the radiation of particles getting sucked in right at the event horizon. Any help would be greatly appreciated. Thanks...`

2. Jun 21, 2004

### mathman

Charged particles, when accelerated, emit radiation. Stuff getting sucked into black holes gets speeded up, gets ionized, and then emits radiation as it further speeds up.

3. Jun 22, 2004

Mathman

Thank you for the info

4. Jun 22, 2004

### Cheman

But why does this happen when they are accelerated?

5. Jun 22, 2004

### ArmoSkater87

Mathman is right but this doesnt apply to the question, he explains only about how radiation (in the form of photons) is emitted from particles that are given high energy. When particles are given high energy the electrons go to an excited state, when they go back to the ground state, the electons emit a photon. This explains how particles emit radiation, but the question is about how patricles that get sucked into a back hole are CONVERTED into energy. This is the case of Einstein's equation, E=mc^2. Although im not too sure myself HOW is happens, but i do know it happens when particles are annihilated, which can happen when it is collided with anti-matter. There are other ways too to convert mass into energy, one very common way is nuclear fusion, which the sun does a lot of. When two protons are fused to make a helium nucleus, the nucleas will have less mass than the two protons separate. The extra mass is converted into enegry according to the equation. I dont know if that at all helps, since i didnt really answer ur question, but i'll keep in touch if i can further help.

6. Jun 23, 2004