Chapter 15 Post-lecture quiz with answers

Chapter 15 Post-lecture quiz with answers - 1 Chapter 15...

Info iconThis preview shows pages 1–2. Sign up to view the full content.

View Full Document Right Arrow Icon
Chapter 15 Post-Lecture Quiz 1. If a star was moved twice as far away, what would happen to it? 1. It would get twice as faint 2. It would get four times fainter 3. It would get fainter and redder 4. It would get fainter and bluer 2. How do we determine the distances to nearby stars? 1. Radar 2. Parallax 3. Measure luminosity, radius, and temperature and infer the distance 4. Compare observed brightness to the sun, and infer the distance 3. Why do the hottest spectra (types O and B) show few absorption lines? 1. Many elements have been used up in these stars 2. These stars are old and were formed before there were many elements in the galaxy 3. Many atoms in these stars are ionized–have lost electrons–so can’t absorb 4. Much of their absorption is in the ultraviolet 5. 3 and 4 4. The spectral sequence in order of decreasing temperature is: 1. OBAGFKM 2. OFBAGKM 3. BAGFKMO 4. ABFGKMO 5. OBAFGKM 5. What is the X-axis in an H-R diagram? 1. Color 2. Temperature 3. Spectral type 4. Any of the above 5. Luminosity or apparent brightness 6. What is the Y-axis in an H-R diagram? 1.
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Image of page 2
This is the end of the preview. Sign up to access the rest of the document.

Page1 / 4

Chapter 15 Post-lecture quiz with answers - 1 Chapter 15...

This preview shows document pages 1 - 2. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online