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Audio Video Interleaved Video  |  2012-12-18  |  8.6 MB  |  400x400  |  3fps  |  2 minutes, 5 seconds
Transcription: Radioactive decay begins with an unstable nucleus. Consider for example the unstable nucleus Uranium 239. Now we're only looking at the nucleus here. The electrons are far far away. Since it's uranium, we know it has 92 protons. Since it's Uranium 239, we know that the total sum of protons and neutrons in the nucleus is 239. Therefore if we know there are 92 protons and 239 total in the nucleus, there must be 147 This nucleus is unstable. It has too many neutrons. So it needs to change its configuration so it has fewer neutrons and more protons. Here's how it happens. Through a process that's ...