※ [本文转录自 NTUGEOLOGY 看板] 作者: Novelist (过) 看板: NTUGEOLOGY 标题: [注意]行星科学导论期中考题 时间: Wed Nov 14 21:13:17 2001 MID-TERM OPEN-BOOK TAKE-HOME TEST "INTRODUCTORY PLANETARY SCIENCE" (Do not discuss with anyone. Due in the next class on 11/12) 1.Fig. 1.8 is for a universe that expands at a constant rate. How should it be modified for a universe that expands at a decreasing rate? How about one that expands at an increasing rate? 2.Why was the big bang unable to make nuclei heavier than 7 amu? How did stars overcome this problem? 3.Why do we need neutrons to make most of the nuclei beyond iron? Where do these neutron come from? 4.Classify Ba isotopes according to the r-, s-, and p-process scheme. Make a plot similar to Fig. 2-14 for isobars at 138 amu. (the nuclear data you need can be found by searching the web for "chart of nuclides") 5.Astronomers no longer believe the disc around the star Beta Pictoris is a planet-forming proto-stellar nebula. Why? What seems to be the nature of this type of disc? 6.Why are meteorites better recorders for early solar system events than rocks on earth? Why are achondrites believed to have formed after the formation of the earliest chonrites? 7.Why do we think that the earth formed at temperature around 1000C? What is the implication of this for the origin of life on earth? ******(10%per question, total 140%, GOOD LUCK! WORK HARD!)****** --- 以上为期中考题全文 因为今天不用上课，所以发下题目後大家就自行离开 没有拿到考卷的同学可参照以上的题目做答 答案的格式不限 请注意，第四题因为须要用到核种表 老师说大家可以上网去查，用老师提供的关键字就可以查到了 另外，请勿互相讨论答案 答案请在下星期三(10/21)上课时交回:) --

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※ 发信站: 批踢踢实业坊(ptt.csie.ntu.edu.tw) ◆ From: 61.217.6.52