1257_Physics ProblemsTechnical Physics

1257_Physics ProblemsTechnical Physics - 598 *P45.7...

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598 Applications of Nuclear Physics * P45.7 (a) The initial mass is 1 007 825 11 009 306 12 017 131 ... u u += . The final mass is 3 4 002 603 12 007 809 .. u bg = . The rest mass annihilated is m = 0009322 . u. The energy created is Qm c == F H G I K J = 2 0 009 322 8 68 u 931.5 MeV 1 u MeV . (b) The proton and the boron nucleus have positive charges. The colliding particles must have enough kinetic energy to approach very closely in spite of their electric repulsion. P45.8 If the electrical power output of 1 000 MW is 40.0% of the power derived from fission reactions, the power output of the fission process is 1000 2 50 10 8 64 10 2 16 10 94 1 4 MW 0.400 Js sd Jd × = × . ej . The number of fissions per day is 216 10 11 10 674 10 14 19 24 1 × × F H G I K J × F H G I K J fission 200 10 eV eV 1.60 J d 6 . This also is the number of 235 U nuclei used, so the mass of 235 U used per day is 235 602 10 263 10 263 24 23 3 . . × × F H G I K J = nuclei d gmo l nuclei mol gd kgd . In contrast, a coal-burning steam plant producing the same electrical power uses more than 61 0 6 × kg d of coal. P45.9
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