chapter29.solutions

chapter29.solutions - Chapter 30 Nuclear Energy and...

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487 Chapter 30 Nuclear Energy and Elementary Particles Problem Solutions 30.6 At 40.0% efficiency, the useful energy obtained per fission event is ( ) ( ) 13 11 0.400 200 M eV event 1.60 10 J M eV 1.28 10 J event event E −− = × The number of fission events required each day is then ( ) ( ) 94 24 1.00 10 J s 8.64 10 s d 6.75 10 eventsd even t t N E ×× == = × × P Each fission event consumes one 235 U atom. The mass of this number of U atoms is () 27 6.75 10 events d 235.044 u 1.66 10 kg u 2.63 kg d atom mN m = ⎡⎤ × = ⎣⎦ In contrast, a coal-burning steam plant producing the same electrical power uses more than 6 61 0 k gd × of coal. t 1800 miles)
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488 CHAPTER 30 30.8 The estimated weight of the naturally occurring uranium is () 91 2 2000 lbs 1 N 1. 01 0 tons 8. 0 N 1 ton 0.224 8 lbs w ⎛⎞ = × ⎜⎟ ⎝⎠ and its mass is 12 11 2 9. 0 kg 9.80 m s w m g × == = × The total number of uranium nuclei contained in this mass of uranium is 36 27 2. 31 0 average m ass of uranium atom 238.03 u1 . 66 10 kg u total m N × = × × Of this total, 0.720% is the fissionable 235 U
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This note was uploaded on 04/15/2009 for the course PHYS 1C taught by Professor Smith during the Spring '07 term at UCSD.

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chapter29.solutions - Chapter 30 Nuclear Energy and...

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