Exploring the Cosmos - Degree Exam 2011 - Life and Death of Stars (Part 1)
1. The alpha process of element building in stars ends at which element?
Hydrogen
Technicium
Iron
Uranium
2. Certain elements are more abundant in stars than others due to the high levels of which other element?
Neon
Boron
Helium
Oxygen
3. Which of the following statements is true?
Two isotopes of an element will have the same numbers of protons and neutrons in their atoms.
Two isotopes of an element will have the same numbers of protons, but different number of neutrons, in their atoms.
Two isotopes of an element will have no protons or neutrons in their atoms.
Two isotopes of an element will have the same numbers of neutrons, but different number of protons, in their atoms.
4. What is the largest baseline that Earth-based telescopes can have for stellar parallax observations?
1 AU
8 AU
2 AU
4 AU
5. If, observed from Earth, an object has a parallactic angle of 1'', how far away is it from us?
1 parsec
1 km
1 AU
1 lightyear
6. Barnard’s Star exhibits the largest observed proper motion. Roughly how fast is this motion?
9 000 kms^-1
90 kms^-1
9 000 000 000 kms^-1
9 000 000 kms^-1
7. If the density of the Earth is 1, what is the density of our Sun?
1
100
0.25
25
8. Main sequence stars correspond to which group on the luminosity classification scheme?
Ib
V
VI
III
9. How much of the Sun's energy arrives at the Earth every second?
14 000 Wm^-2
1 400 Wm^-2
140 Wm^-2
140 000 Wm^-2
10. As the temperature of a blackbody emitter falls, what happens to its peak emission frequency?
It is not possible to determine what happens to the frequency without knowing the mass of the star.
As temperature falls, the peak frequency is unchanged.
As temperature falls, the peak frequency increases.
As temperature falls, the peak frequency falls.
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