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