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.
frequency.
wavelength squared.
2. The spectral sequence of stars in order of decreasing temperature is
FGKMOAB
ABFGKMO
OBAFGKM
OABMFGK
3. Under favourable conditions the faintest stars visible to the naked eye are of magnitude
16
-6
26
6
4. The absolute magnitude of a star is the magnitude it would have if it was at a distance of
100 parsecs
1 parsec
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?
2.5 times
100 times
25 times
10 times
6. The apparent brightness of a star decreases in proportion to the _____ power of its distance.
forth
third
first
second
7. Eclipsing binaries can be regarded as a sub-class of ______ binaries.
X-ray
astrometric
visual
spectroscopic
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?
Epsilon Eridani
Barnard’s Star
Proxima Centauri
Betelgeuse
10. What is the rough distance from our star to the closest star to our star?
4.3 parsecs
43 lightyears
4.3 lightyears
43 parsecs
11. The spectral sequence of stars in order of decreasing temperature is
OBAFGKM
FGKMOAB
OABMFGK
ABFGKMO
12. The sun is a star of luminosity class
III.
II.
V.
IV.
13. A first magnitude star is _________ than a second magnitude star.
larger
brighter
smaller
fainter
14. What kind of binary was Sirius classified as when its binary nature was first established?
Spectroscopic
Visual
Photometric
Astrometric
15. Eclipsing binaries can be regarded as a sub-class of ______ binaries.
spectroscopic
X-ray
astrometric
visual
16. The sun is a star of luminosity class
IV.
II.
III.
V.
17. The star Algol is a famous example of a binary system which is
eclipsing.
X-ray.
astrometric.
spectroscopic.
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?
10000.
1000.
100.
10.
20. Roughly what percentage of observed stars are classed as white dwarfs?
50%
1%
99%
10%
21. The longest period binaries are likely to be of which type?
Spectroscopic
Photometric
Eclipsing
Visual
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