Exam Prep Survey in Blue Palen - Understanding Our Universe 3e Complete Test Bank by Stacy Palen. DOCX document preview.
Mission 7: Survey in Blue
MULTIPLE CHOICE
1. Which of the following is the peak wavelength for a star with a surface temperature of 29,000 K?
a. 1 m d. 1000 mm or 1 micron
b. 1 cm e. 100 nanometers
c. 1 mm
2. Which main-sequence star spectral type has the longest hydrogen-burning lifetime?
a. M-type d. B-type
b. G-type e. O-type
c. F-type
3. Which of the following main-sequence stars is the most luminous?
a. K-type d. O-type
b. M-type e. G-type
c. J-type
4. B-type stars were initially classified with a “B” because
a. these stars are blue in color.
b. these stars have the second-weakest hydrogen absorption lines.
c. these stars were thought to be cooler than A-type stars.
d. these stars were thought to be the second most metal-rich stars.
e. these stars were thought to be slightly smaller than A-type stars.
5. Assume you observe two twin B-type stars. Star A is 10 times closer to you than Star B. Which of the following is true?
a. Star A is one-tenth the brightness of Star B
b. Star A is 10 times brighter than Star B
c. Star A is 100 times brighter than Star B
d. Star A is 10000 times brighter than Star B
e. There is not enough information to answer.
1. B-type main-sequence stars, despite being more massive than Sun-like, G-type main-sequence stars, live considerably shorter lives (that is, they burn hydrogen in the cores for a much shorter time). How can this be?
2. Why do B-type stars appear blue?