Why and when did these processess cease?
2006-09-04 21:52:04 · 5 answers · asked by pinkflyblooming 2 in Science & Mathematics ➔ Chemistry
One hundred seconds after the Big Bang....
The temperature dropped to the point where protons and neutrons could stick together without being torn apart by highly energetic photons. Also, the neutrinos and antineutrinos would have lost their ability to interact with protons or neutrons (due to an expanding universe), and all of the positrons (electrons' antimatter particle), had been annihilated.
For 300,000 years... protons and atomic nuclei continued to roam about in a almost totally opaque sea of photons, electrons and neutrinos - opaque because the photons couldn't travel far without bumping into another particle. Any electron that combined with a proton or atomic nucleus was immediately knocked off by a travelling photon.
But after about 300,000 years... the opaque soup of nuclear matter and radiation began to clear. By this time, the temperature of the universe dropped to 3,000 K. Photons no longer had enough energy to knock electrons free from atomic nuclei and protons. Now the photons were free to travel through the universe, at last decoupled from matter.
13.7 billion years later... we get the Internet, Chinese food, etc.
2006-09-05 03:58:42 · answer #1 · answered by Mowgli 6 · 0⤊ 0⤋
Hey,
You should definitely try Photon (get one of the latest versions though). Link http://j.mp/1k407rL
Check it out
Have a nice day
2014-07-24 15:35:43 · answer #2 · answered by Anonymous · 0⤊ 0⤋
No.They dont interract at all.they better produce photons.
2006-09-05 07:08:04 · answer #3 · answered by falowofemi 1 · 0⤊ 0⤋
as above
2006-09-05 16:22:54 · answer #4 · answered by Anonymous · 1⤊ 0⤋
They don't - they are mutually exclusive - init ?
2006-09-05 05:00:54 · answer #5 · answered by Arthur P 2 · 0⤊ 0⤋