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