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Chapter 12 1 Copyright © The McGraw-Hill Companies, Inc. Permission required for reproduction or display 1. Using information in the back of your textbook, determine the parallax angle to the very closest star. a) 0.23 arcsec b) 4.23 arcsec c) 0.77 arcsec d) 1.30 arcsec 2 Copyright © The McGraw-Hill Companies, Inc. Permission required for reproduction or display 2. Consider two stars in the constellation Pasta Major: alpha Tortellini (bright in the UV, dim in the IR) beta Linguini (dim in the UV, bright in the IR) Which star is hotter? a) alpha Tortellini b) beta Linguini c) too little information to answer 3 Copyright © The McGraw-Hill Companies, Inc. Permission required for reproduction or display 3. Star A has a radius R and a temperature T. Star B has the same temperature and is at the same distance from the Sun as star A. However, it is 4 times larger than star A. How many times more luminous is star B? a) 16 b) 4 c) both have the same luminosity d) not enough information to tell 4 Copyright © The McGraw-Hill Companies, Inc. Permission required for reproduction or display 4. Star A has a radius R and a temperature T. Star B is at the same distance from the Sun as star A. However, it is 4 times larger than star A and two times cooler. How many times more luminous is star B? a) 16 b) 4 c) both have the same luminosity d) not enough information to tell 5 Copyright © The McGraw-Hill Companies, Inc. Permission required for reproduction or display Chapter 13 6 Copyright © The McGraw-Hill Companies, Inc. Permission required for reproduction or display 5.What causes the red color? 6.The cone shaped object is a) Cold dust and gas a) Hydrogen emission obscuring radiation b) Hydrogen absorption c) Doppler shifted radiation b) Bi-polar jet 7 Copyright © The McGraw-Hill Companies, Inc. Permission required for reproduction or display 7. The nebulae around protostars are shaped into disks because of the same process that causes dough to become flat when it is a) spun in the air like pizza dough b) rolled with a pin like pizza dough c) squashed between plates like dough for a burrito d) baked on a flat sheet like a cookie. 8 Copyright © The McGraw-Hill Companies, Inc. Permission required for reproduction or display 8. The factors that tend to work against collapse are I. The magnetic field of the cloud II. The presence of a supernova nearby III. The existence of molecules in the gas IV. Heat in the gas V. rotation of the cloud a) I, III, V b) I, IV, V c) II, III, V d) II, IV, V e) III, IV, V 9 Copyright © The McGraw-Hill Companies, Inc. Permission required for reproduction or display 9. A B0 Main Sequence star is 17.5 times more massive than the Sun and 30,000 times more luminous. Such a star will spend approximately _____ years on the Main Sequence. a) 30,000 b) 6 million c) 1,700 d) 1.7x1013 e) 17.5x1013 10 Copyright © The McGraw-Hill Companies, Inc. Permission required for reproduction or display A 10. Youngest to oldest: a) B, C, A b) A, C, B c) C, A, B d) C, B, A 11 B Copyright © The McGraw-Hill Companies, Inc. Permission required for reproduction or display C 11. Which of the following sequences correctly describes the evolution of the Sun from young to old? a) white dwarf, red giant, main sequence, protostar b) red giant, main-sequence, white dwarf, protostar c) protostar, red giant, main sequence, white dwarf d) protostar, main sequence, white dwarf, red giant e) protostar, main sequence, red giant, white dwarf 12 Copyright © The McGraw-Hill Companies, Inc. Permission required for reproduction or display 12. Stars like the Sun probably do not form iron cores during their evolution because a) all of the iron is ejected when they become planetary nebulae b) their cores never get hot enough for them to make iron by nucleosynthesis c) the iron they make by nucleosynthesis is all fused into carbon d) their strong magnetic fields keep their iron in the atmosphere e) none of the above 13 Copyright © The McGraw-Hill Companies, Inc. Permission required for reproduction or display 1. C 2. A 3. A 4. C 5. A 6. A 7. A 8. B 9. B 10.D 11.E 12.B 14 Copyright © The McGraw-Hill Companies, Inc. Permission required for reproduction or display