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.
frequency.
frequency squared.
wavelength.
2. The spectral sequence of stars in order of decreasing temperature is
FGKMOAB
OABMFGK
OBAFGKM
ABFGKMO
3. Under favourable conditions the faintest stars visible to the naked eye are of magnitude
6
26
-6
16
4. The absolute magnitude of a star is the magnitude it would have if it was at a distance of
1 parsec
10 parsecs
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
2.5 times
10 times
25 times
6. The apparent brightness of a star decreases in proportion to the _____ power of its distance.
first
third
second
forth
7. Eclipsing binaries can be regarded as a sub-class of ______ binaries.
spectroscopic
X-ray
visual
astrometric
8. What type of binary star typically has the longest period?
Visual
Eclipsing
Photometric
Spectroscopic
9. Which is the closest star to our own Sun?
Betelgeuse
Epsilon Eridani
Proxima Centauri
Barnard’s Star
10. What is the rough distance from our star to the closest star to our star?
43 parsecs
4.3 parsecs
4.3 lightyears
43 lightyears
11. The spectral sequence of stars in order of decreasing temperature is
FGKMOAB
OBAFGKM
OABMFGK
ABFGKMO
12. The sun is a star of luminosity class
V.
IV.
III.
II.
13. A first magnitude star is _________ than a second magnitude star.
fainter
brighter
smaller
larger
14. What kind of binary was Sirius classified as when its binary nature was first established?
Visual
Photometric
Spectroscopic
Astrometric
15. Eclipsing binaries can be regarded as a sub-class of ______ binaries.
spectroscopic
X-ray
visual
astrometric
16. The sun is a star of luminosity class
V.
II.
IV.
III.
17. The star Algol is a famous example of a binary system which is
astrometric.
spectroscopic.
X-ray.
eclipsing.
18. The luminosity of a star is proportional to its temperature raised to what power?
Fifth (i.e. T^5)
Third (i.e. T^3)
Forth (i.e. T^4)
Second (i.e. T^2)
19. A magnitude 5 star is how many times brighter than a magnitude 10 star?
100.
10.
1000.
10000.
20. Roughly what percentage of observed stars are classed as white dwarfs?
1%
10%
99%
50%
21. The longest period binaries are likely to be of which type?
Photometric
Spectroscopic
Eclipsing
Visual
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