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 squared.
wavelength.
frequency.
wavelength squared.
2. The spectral sequence of stars in order of decreasing temperature is
ABFGKMO
FGKMOAB
OBAFGKM
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
10 parsecs
1 parsec
100 parsecs
1 AU
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
third
second
first
7. Eclipsing binaries can be regarded as a sub-class of ______ binaries.
spectroscopic
X-ray
astrometric
visual
8. What type of binary star typically has the longest period?
Spectroscopic
Eclipsing
Visual
Photometric
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 parsecs
43 lightyears
4.3 parsecs
4.3 lightyears
11. The spectral sequence of stars in order of decreasing temperature is
FGKMOAB
OBAFGKM
ABFGKMO
OABMFGK
12. The sun is a star of luminosity class
V.
IV.
II.
III.
13. A first magnitude star is _________ than a second magnitude star.
brighter
fainter
larger
smaller
14. What kind of binary was Sirius classified as when its binary nature was first established?
Astrometric
Photometric
Spectroscopic
Visual
15. Eclipsing binaries can be regarded as a sub-class of ______ binaries.
spectroscopic
astrometric
X-ray
visual
16. The sun is a star of luminosity class
II.
V.
IV.
III.
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)
Second (i.e. T^2)
Forth (i.e. T^4)
Third (i.e. T^3)
19. A magnitude 5 star is how many times brighter than a magnitude 10 star?
100.
10000.
10.
1000.
20. Roughly what percentage of observed stars are classed as white dwarfs?
50%
10%
1%
99%
21. The longest period binaries are likely to be of which type?
Spectroscopic
Photometric
Eclipsing
Visual
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