Physics II Leeson Name________________________________ Block_____ Date______________________ Test XII, Stellar Evolution I.Matching A. Nova F. Stellar Evolution B. Event Horizon G. Thermonuclear Fusion C. Temperature H. Pulsar D. Absolute Magnitude I. Apparent Magnitude E. Equilibrium J. Main Sequence ___1. The study of the life cycles of stars. ___2. Indicated by spectral class. ___3. Brightness as seen from Earth under normal conditions. ___4. A nuclear reaction in which 2 or more atoms become one atom with more mass. ___5. The brightness of a star if it were 10 parsecs from Earth. ___6. When forces are balanced, creating a situation without change. ___7. A neutron star that is spinning so that its jets point at the Earth regularly. ___8. An explosion that occurs when a star loses equilibrium. ___9. The part of the H-R diagram where stars spend most of their life-times. ___10. A location from which nothing can escape, even light. II.True – False. put a Printed Capitol "T" or "F" in each blank. ___1. Stars are formed in nebulae. ___2. Fast-spinning young stars can form binary star systems. ___3. High-mass stars burn cooler and slower than low-mass stars. ___4. Variable stars can have a period of 10 days. ___5. The mass limits of stars seems to be between 0.08M® and 120M® ___6. A white dwarf will eventually become a black hole. ___7. A white dwarf is the other end of a black hole. ___8. Sun-like stars can eventually become a white dwarf. ___9. A Pulsar is a Neutron Star. ___10. All stars form an Iron core before they die. ___11. When 2 Hydrogen atoms fuse, it forms a Helium atom. ___12. O-class and B-class stars are blue and hot. ___13. The main sequence is broken up into 3 sections, based on mass. III. Chronological Order – Put the following in order by placing a number (1-4) in the blanks. ___The star starts to Hick-up ___The White Dwarf cools for billions of years. ___The star moves slowly up and left along the main sequence. ___The star ignites and Fuses Hydrogen into Helium. IV.Label both axes of the Hertzsprung-Russell Diagram, including some sort of scale, then label the places where each of the stars (or groups) are. V.Short answer – Write a short paragraph to explain each of the following. (topic sentence optional) In other words, if you just said that statement, and somebody said, “What?” how would you explain yourself? 1.Canopus has an apparent magnitude of about -1, while Vega is about 0. 2.We don't know what will happen to a star whose mass is 0.08M®. 3. Some stars don't have a consistent brightness. 4.During normal fusion even the massive stars stop when they have an iron (Fe) core. 5.So, uh, how do we get Uranium, smart guy? 6.Oh, be a fine girl. Kiss me.