Nuclear Fission Chain reaction requires a critical mass to proceed 10 kg U-235 = 2.5 x 10 25 atoms 1,2,4,8 … 2.5 x 10 25 = 85 steps @ 1/1,000,000 sec per step = 1/10,000 sec After 64 steps, T = 10,000 K (twice as hot as sun) Have only completed 1/1,000,000 of fission
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