※ [本文轉錄自 NTUGEOLOGY 看板] 作者: Novelist (過) 看板: NTUGEOLOGY 標題: [注意]行星科學導論期中考題 時間: 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!)****** --- 以上為期中考題全文 因為今天不用上課，所以發下題目後大家就自行離開 沒有拿到考卷的同學可參照以上的題目做答 答案的格式不限 請注意，第四題因為須要用到核種表 老師說大家可以上網去查，用老師提供的關鍵字就可以查到了 另外，請勿互相討論答案 答案請在下星期三(10/21)上課時交回:) --

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