Exploring the Cosmos - Class Test 2 - Life and Death of Stars (Part 1)
1. The energy of a photon emitted as a result of an atomic transition is proportional to its
frequency.
frequency squared.
wavelength.
wavelength squared.
2. The spectral sequence of stars in order of decreasing temperature is
OABMFGK
ABFGKMO
OBAFGKM
FGKMOAB
3. Under favourable conditions the faintest stars visible to the naked eye are of magnitude
6
-6
16
26
4. The absolute magnitude of a star is the magnitude it would have if it was at a distance of
100 parsecs
1 AU
1 parsec
10 parsecs
5. If star A is magnitude 2, and star B is magnitude 3, by how many times is star A brighter than star B?
25 times
100 times
10 times
2.5 times
6. The apparent brightness of a star decreases in proportion to the _____ power of its distance.
third
second
forth
first
7. Eclipsing binaries can be regarded as a sub-class of ______ binaries.
X-ray
spectroscopic
visual
astrometric
8. What type of binary star typically has the longest period?
Visual
Spectroscopic
Photometric
Eclipsing
9. Which is the closest star to our own Sun?
Proxima Centauri
Betelgeuse
Barnard’s Star
Epsilon Eridani
10. What is the rough distance from our star to the closest star to our star?
43 lightyears
4.3 parsecs
4.3 lightyears
43 parsecs
11. The spectral sequence of stars in order of decreasing temperature is
OBAFGKM
ABFGKMO
FGKMOAB
OABMFGK
12. The sun is a star of luminosity class
III.
II.
V.
IV.
13. A first magnitude star is _________ than a second magnitude star.
fainter
larger
smaller
brighter
14. What kind of binary was Sirius classified as when its binary nature was first established?
Visual
Photometric
Spectroscopic
Astrometric
15. Eclipsing binaries can be regarded as a sub-class of ______ binaries.
visual
spectroscopic
X-ray
astrometric
16. The sun is a star of luminosity class
II.
IV.
V.
III.
17. The star Algol is a famous example of a binary system which is
spectroscopic.
eclipsing.
X-ray.
astrometric.
18. The luminosity of a star is proportional to its temperature raised to what power?
Forth (i.e. T^4)
Third (i.e. T^3)
Fifth (i.e. T^5)
Second (i.e. T^2)
19. A magnitude 5 star is how many times brighter than a magnitude 10 star?
100.
10.
1000.
10000.
20. Roughly what percentage of observed stars are classed as white dwarfs?
99%
10%
1%
50%
21. The longest period binaries are likely to be of which type?
Spectroscopic
Visual
Photometric
Eclipsing
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