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