Astronomy

1.	Quiz 4 - Q1
	The nearest star to our Sun, Alpha Centauri, is still over a parsec distant. Student Response Value Correct Answer True 100% True Score: 5/5
2.	Quiz 4 - Q2
	The proper motion of a star is its true velocity through space Student Response Value Correct Answer False 100% False Score: 5/5
3.	Quiz 4 - Q3
	First magnitude Spica appears 2.5 times brighter than second magnitude Polaris Student Response Value Correct Answer True 100% True Score: 5/5
4.	Quiz 4 - Q4
	A nearby star has a parallax of 0.2 arc seconds. What is its distance?   Student Response Value Correct Answer Feedback 1. 0.1 parsec     2. 0.2 parsec     3. 0.5 parsec      4. 5 parsecs 100%      5. 50 parsecs     Score: 5/5
5.	Quiz 4 -Q5
	Procyon lies about 13 light years distant, thus its parallax is about:   Student Response Value Correct Answer Feedback 1. 0.01"      2. 0.25" 100%      3. 0.40"     4. 0.65"     5. 1.3"     Score: 5/5
6.	Quiz 4 - Q6
	If a star appears to move back and forth relative to other stars over a six-month period, this motion is due to the star's   Student Response Value Correct Answer Feedback 1. transverse motion.     2. radial motion.      3. parallax shift. 100%      4. doppler shift.     5. true space motion.     Score: 5/5
7.	Quiz 4 - Q7
	Hydrogen lines are weaker in both very hot and very cool stars. Student Response Value Correct Answer True 100% True Score: 5/5
8.	Quiz 4 - Q8
	A type B9 star is hotter than a type A0. Student Response Value Correct Answer True 100% True Score: 5/5
9.	Quiz 4 - Q9
	On the main sequence, almost all stars have radii between about 0.1 and 10 times the Sun. Student Response Value Correct Answer True 100% True Score: 5/5
10.	Quiz 4 - Q10
	In order to turn a star's proper motion into its space velocity, we must also know:   Student Response Value Correct Answer Feedback 1. its mass and spectral type.     2. its temperature and age.      3. its distance and radial velocity. 100%      4. its distance and mass.     5. its spectral type and period of rotation.     Score: 5/5
11.	Quiz 4 - Q11
	What is the absolute magnitude of our Sun?   Student Response Value Correct Answer Feedback 1. -23.0     2. -4.6     3. -1.4      4. +4.8 100%      5. +9.4     Score: 5/5
12.	Quiz 4 - Q12
	The Sun's complete classification is G2V. Student Response Value Correct Answer True 100% True Score: 5/5
13.	Quiz 4 - Q13
	In a spectroscopic binary, the star whose lines shift the most weighs the most. Student Response Value Correct Answer False 100% False Score: 5/5
14.	Quiz 4 - Q14
	Star A and star B both have an absolute magnitude of 2.0, but star A has an apparent magnitude of 5.0 and star B has an apparent magnitude of 7.0. Which statement below is correct?   Student Response Value Correct Answer Feedback 1. Star A appears brighter than star B, but actually star B and star A are the same brightness.      2. Star B appears brighter than star A, but actually star B and star A are the same brightness.     3. Star A and star B appear to have the same brightness, but actually star B is brighter than star A.      4. Star A and star B appear to have the same brightness, but actually star A is brighter than star B. 0%     5. It is impossible to determine how bright these stars are or appear to be relative to one another, given the information above.     Score: 0/5
15.	Quiz 4 - Q15
	What are the two most important intrinsic properties used to classify stars? A) mass and age B) luminosity and surface temperature C) distance and luminosity D) distance and surface temperature E) distance and color   Student Response Value Correct Answer Feedback 1. mass and age      2. luminosity and surface temperature 100%      3. distance and luminosity     4. distance and surface temperature     5. distance and color     Score: 5/5
16.	Quiz 4 - Q16
	Which of the following is the most common type of star?   Student Response Value Correct Answer Feedback 1. high mass main sequence     2. low mass main sequence      3. white dwarfs      4. red giants 0%     5. blue suergiants     Score: 0/5
17.	Quiz 4 - Q17
	The Hertzsprung-Russell Diagram plots ________ against the spectral type or temperature.   Student Response Value Correct Answer Feedback 1. distance     2. brightness or apparent magnitude      3. luminosity or absolute magnitude 100%      4. size or density     5. mass     Score: 5/5
18.	Quiz 4 - Q18
	On the H-R diagram, white dwarfs lie Sirius B and Procyon B lie   Student Response Value Correct Answer Feedback 1. at the top left.     2. at the top right.     3. close to the Sun, near the center.      4. at the lower left. 100%      5. at the lower right.     Score: 5/5
19.	Quiz 4 - Q19
	What is the single most important characteristic in determining the course of a star's evolution?   Student Response Value Correct Answer Feedback 1. density     2. absolute brightness     3. distance     4. surface temperature      5. mass 100%      Score: 5/5
20.	Quiz 4 - Q20
	The vast majority of stars near us would fall to the bottom right on the H-R diagram Student Response Value Correct Answer True 100% True Score: 5/5