quiz1spr01 - ENGSC 3313, Spring 2001 Answer any 4 Questions...

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ENGSC 3313, Spring 2001 Quizl Name Answer any 4 Questions only, 1 point each Tritium is used in all modem American nuclear weapons, but needs to be periodically replaced because it has a halflife of 12.3 years. The US used to make tritium in up to 14 nuclear reactors all ofwhich have closed down since 1988. They will need new supplies after 2011. Congress wishes to build a new reactor in South Carolina. Assuming tritium was 'made' in 1988, what proportion has decayed by the year 2001 ? !::.J. = e-tl]. . Ao Substituting, 0.5 = e-12.3/~ A = 17.75 Repeating ~ = e-13/17.75 = 0.48 o 0.48 left, hence m decayed (52%) 2. Neodymium, element #60, is used to put the "spark" in lighters. Please give the most probable electron configuration. 182282 2p6 382 3p6 482 3dlO 4p6 582 4dlO 5p6 682 4f" Nd: OR Is 2s 3s 4s Ss 6s 7s 8s Nd: [Xe} 6s24~ 3 I have a 1976 article in my file that refers to a considerable feat of materials synthesis to make a GaN electroluminescent device that emitted fairly efficiently
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quiz1spr01 - ENGSC 3313, Spring 2001 Answer any 4 Questions...

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