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