Chapter 17 post-lecture quiz with answers

Chapter 17 post-lecture quiz with answers - 1 Chapter 17...

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Chapter 17 Post-lecture Quiz 1. A star’s life is a struggle between _______, wanting to crush it, and _______, wanting to expand it. 1. Nuclear forces, hot gasses 2. Gravity, nuclear fusion 3. Gravity, convection 4. Gravity, gas pressure 5. Gas pressure, radiation 2. When does a star leave the main sequence? 1. After a few million years 2. After a few billion years 3. It depends on its mass 4. When the hydrogen fuel in its core is used up 5. 3 and 4 3. What happens to nuclear fusion when the hydrogen in a star’s core runs low? 1. It stops 2. It shifts from the core to a shell around the core 3. Other elements start to fuse 4. The star goes out of balance and becomes a red giant 5. 2 and 4 4. In a red giant star, three helium atoms ( 4 He) can fuse together to: 1. Make more energy for the star 2. Give the star additional life 3. Create the element carbon ( 12 C) 4. 1 and 3 5. 1, 2, and 3 5. After the Sun becomes a red giant star and makes carbon in its core, why will it not make heavier elements? 1. It will have run out of fuel 2. It’s near the end of its life and doesn’t have time 3. It is not massive enough to make it hot enough for further reactions 4. The heavier elements will all go into a planetary nebula 5. 1 and 2 6. What happens when a star exhausts its core hydrogen supply? 1. It contracts, becoming smaller and dimmer. 2. It contracts, becoming hotter and brighter. 3. Its core contracts, but its outer layers expand and the star becomes bigger but cooler and therefore remains at the same brightness. 4. It expands, becoming bigger but dimmer. 5.
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This note was uploaded on 03/03/2011 for the course RSM 100 taught by Professor Oesch during the Spring '08 term at University of Toronto- Toronto.

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Chapter 17 post-lecture quiz with answers - 1 Chapter 17...

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