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.
wavelength.
frequency squared.
frequency.
2. The spectral sequence of stars in order of decreasing temperature is
FGKMOAB
OBAFGKM
ABFGKMO
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
1 AU
100 parsecs
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.
second
forth
first
third
7. Eclipsing binaries can be regarded as a sub-class of ______ binaries.
visual
spectroscopic
X-ray
astrometric
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?
Barnard’s Star
Proxima Centauri
Epsilon Eridani
Betelgeuse
10. What is the rough distance from our star to the closest star to our star?
43 lightyears
4.3 lightyears
4.3 parsecs
43 parsecs
11. The spectral sequence of stars in order of decreasing temperature is
OABMFGK
FGKMOAB
OBAFGKM
ABFGKMO
12. The sun is a star of luminosity class
V.
III.
II.
IV.
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
Photometric
Astrometric
Visual
15. Eclipsing binaries can be regarded as a sub-class of ______ binaries.
astrometric
visual
X-ray
spectroscopic
16. The sun is a star of luminosity class
III.
IV.
V.
II.
17. The star Algol is a famous example of a binary system which is
astrometric.
X-ray.
spectroscopic.
eclipsing.
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)
Second (i.e. T^2)
Third (i.e. T^3)
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?
99%
10%
50%
1%
21. The longest period binaries are likely to be of which type?
Visual
Eclipsing
Spectroscopic
Photometric
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