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1258_Physics ProblemsTechnical Physics

# 1258_Physics ProblemsTechnical Physics - Chapter 45 P45.11...

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Chapter 45 599 P45.11 mass of U available metric tons g 1 metric ton g 235 F H G I K J = × 0 007 10 10 7 10 9 6 12 . a f e j number of nuclei g 235 g mol nuclei mol nuclei × F H G I K J × = × 7 10 6 02 10 1 8 10 12 23 34 . . e j The energy available from fission (at 208 MeV/event) is E × × = × 1 8 10 208 1 60 10 6 0 10 34 13 23 . . . events MeV event J MeV J e j b g e j . This would last for a time interval of t E = × × = × × F H G I K J P 6 0 10 8 6 10 1 3 000 23 10 . . J 7.0 10 J s s yr 3.16 10 s yr 12 7 e j . P45.12 In one minute there are 60 0 5 00 10 4 . . s 1.20 ms fissions = × . So the rate increases by a factor of 1 000 25 2 68 10 50 000 5 . . b g = × . P45.13 P = = × 10 0 1 00 10 7 . . MW J s If each decay delivers 1 00 1 60 10 13 . . MeV J = × , then the number of decays/s = × 6 25 10 19 . Bq . Section 45.4 Nuclear Fusion P45.14 (a) The Q value for the D-T reaction is 17.59 MeV. Specific energy content in fuel for D-T reaction:
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