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exam3Review - Exam#3 Exam#3 is Thursday 4/29 in this room...

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ISP209s10 Exam3 Review -1- Exam #3 Exam #3 is Thursday 4/29 in this room You can bring 2 page of notes (front and back) Bring your calculator and a #2 pencil Exam 3 covers material from 4/1 onward (only 8 lectures) Consequently, no extra credit for Exam 3 NOTE: Last HW (# 11) due Friday 4/30 at 8am
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ISP209s10 Exam3 Review -2- Final Exam The Final Exam is on LON-CAPA. Opens 4/29 at 4pm and is due Monday 5/3 at 4 pm. I don’t care if you work together and/or use your notes. Consequently, no extra credit for the Final. Pay close attention to the # of tries you are given for each problem. Some will only have 1 try, whereas others will have more.
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ISP209s10 Exam3 Review -3- Exam 3 review A detailed outline of study topics is here: http://www.nscl.msu.edu/~bogner/isp209s2010/review3.htm
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ISP209s10 Exam3 Review -4- How do we measure properties of a star? How do we know what our sun (and other stars) are made of ? How do we know the temperature? How do we know the size? From the spectrum of the EM radiation from the star (“Blackbody radiation”)
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ISP209s10 Exam3 Review -5- Some Clicker Questions - #1 What happens to a star if its surface temperature is increased and its size remains the same? A) It only gets brighter B) It only gets more red C) It gets brighter and more blue D) It only gets dimmer E) It gets dimmer and more red Hint: recall how color correlates with temperature
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ISP209s10 Exam3 Review -6- Some Clicker Questions - #1 What happens to a star if its surface temperature is increased and its size remains the same? A) It only gets brighter B) It only gets more red C) It gets brighter and more blue D) It only gets dimmer E) It gets dimmer and more red Remember the correlation between color and Temperature Blue: Hotter Red: Colder
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ISP209s10 Exam3 Review Hertzsprung-Russell Diagram:How a star evolves Luminosity vs. Temperature Observed stars tend to fall on various “branches” in this plot. Which “branch” a star Falls on depends on How it generates its Energy (I.e., what Fusion chains occur)
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-8- A Sample Problem Suppose star A and star B have the same luminosity. If star A is 5 times brighter than star B, what can we say about their relative distances? Star B is farther away a b a b b b a a b a d d d d d L d L b b d L brightness ! = " = = = = = 5 5 4 4 4 (distance) 4 luminosity 2 2 2 2 2 2 # # # #
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ISP209s10 Exam3 Review -9- Some Other Star Things … Know what powers stars (nuclear fusion reactions) Know the 4 steps in how a star is born Know that the most important variable that controls a star’s features is its mass. Be familiar with the timeline evolution of our own sun. Understand what we mean when we say “we are star stuff”.
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ISP209s10 Exam3 Review -10- How did the Universe Begin? Evidence points to the Universe beginning in a hot fireball 13.7 billion years ago. We call this the Big Bang Evidence for the Big Bang Expansion of the Universe The Big Bang model correctly predicts the formation of the light elements observed to be present in the early universe (mostly hydrogen and helium).
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