PHYS 1061 Lecture Notes - Lecture 39: Electronvolt, Unified Atomic Mass Unit, Deuterium
Document Summary
Lecture - 39: mass difference is 4. 029 4. 0015 = 0. 0276 a. m. u. 0. 7% of mass disappears, transforming to energy. 1 a. m. u. (atomic mass unit) is 1. 6605 10-27 kg. Multiply by c2 to get 4. 12(cid:1)10-12 j. 1 mole (6. 022(cid:1)1023 particles) of protons (cid:1) 2. 5(cid:1)1012 j. Nuclear fusion is ~20 million times more potent stuff! Works out to 150 million calories per gram: compare to 16 million cal/g uranium, 10 cal/g gasoline, artificial fusion, 16 million degrees in sun"s center is just enough to keep the process going. But sun is huge, so it seems prodigious: in laboratory, need higher temperatures still to get worthwhile rate of fusion (or proton-proton (cid:1) deuteron) events. 1h + 1h 2h + e+ + (cid:1: bottleneck in process is the reaction, better off starting with deuterium plus tritium. 2h and 3h, sometimes called 2d and 3t: then:
