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