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
wavelength.
frequency squared.
wavelength squared.
frequency.
2. The spectral sequence of stars in order of decreasing temperature is
OABMFGK
FGKMOAB
OBAFGKM
ABFGKMO
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
10 parsecs
1 parsec
1 AU
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
10 times
100 times
2.5 times
6. The apparent brightness of a star decreases in proportion to the _____ power of its distance.
second
forth
first
third
7. Eclipsing binaries can be regarded as a sub-class of ______ binaries.
astrometric
visual
X-ray
spectroscopic
8. What type of binary star typically has the longest period?
Eclipsing
Visual
Spectroscopic
Photometric
9. Which is the closest star to our own Sun?
Proxima Centauri
Barnard’s Star
Epsilon Eridani
Betelgeuse
10. What is the rough distance from our star to the closest star to our star?
4.3 lightyears
43 parsecs
43 lightyears
4.3 parsecs
11. The spectral sequence of stars in order of decreasing temperature is
FGKMOAB
ABFGKMO
OABMFGK
OBAFGKM
12. The sun is a star of luminosity class
II.
V.
IV.
III.
13. A first magnitude star is _________ than a second magnitude star.
fainter
brighter
larger
smaller
14. What kind of binary was Sirius classified as when its binary nature was first established?
Astrometric
Spectroscopic
Visual
Photometric
15. Eclipsing binaries can be regarded as a sub-class of ______ binaries.
X-ray
spectroscopic
visual
astrometric
16. The sun is a star of luminosity class
III.
II.
IV.
V.
17. The star Algol is a famous example of a binary system which is
spectroscopic.
X-ray.
eclipsing.
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)
Second (i.e. T^2)
Fifth (i.e. T^5)
19. A magnitude 5 star is how many times brighter than a magnitude 10 star?
1000.
10.
100.
10000.
20. Roughly what percentage of observed stars are classed as white dwarfs?
99%
50%
1%
10%
21. The longest period binaries are likely to be of which type?
Photometric
Visual
Spectroscopic
Eclipsing
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