Final Exam Practice Problems Flashcards
1
Q
- Which number is closest to the sun’s absolute magnitude?
A
c) +5
2
Q
- Which number is closest to the sun’s apparent magnitude?
A
a) -27
3
Q
- A star that is 40 parsec away has an apparent magnitude equal to 7 but an absolute magnitude equal to 4. What is this star’s distance modulus?
A
a) 3
4
Q
- If a star that is exactly like the sun were 10 parsec away from Earth, would you be able to see it in the night-time sky without binoculars or a telescope?
A
a) Yes
5
Q
- How far away is a star with a parallax angle of 300 mas?
A
b) 3.3
6
Q
- How far away is a star with a distance modulus of +8?
A
d) 400
7
Q
- If a star’s parallax angle is 50 mas, what is its distance modulus?
A
c) +1.5
8
Q
- The parallax angle of a star is…
A
a) shift in background stars
9
Q
- The human eye is most sensitive to [blank] light.
A
c) Yellow-Green
10
Q
- The redder a star looks,
A
a) Big
11
Q
- As an object (a star, for example) cools,
A
e) Ultraviolet Light emissions
12
Q
- A star with a temperature of 30,000 K is brightest in the [blank] part of the electromagnetic spectrum.
A
c) Ultraviolet
13
Q
- The absolute magnitude of a main-sequence G star is nearest…
A
c) +5
14
Q
- The sun’s spectral type is…
A
e) G2V
15
Q
Compared to the sun, an M2I star is
A
Bigger & cooler
16
Q
The B-V color of a main-sequence M star is nearest. . .
A
a) -1.7
17
Q
How do the lifetimes of high-mass stars compare to the lifetimes of low-mass stars?
A
b) Low mass lives a lot longer
18
Q
Hotter main-sequence stars are generally [blank] than cooler stars.
A
a) Brighter
19
Q
- Why are red giant stars so bright?
A
a) Because they are Big
20
Q
The habitable zone around a star is a region where…
A
Liquid water could exist on an Earth-like planet
21
Q
Compared to the sun’s habitable zone, around an F star the habital zone is…
A
Further
22
Q
- Why don’t astronomers expect to find complex, intelligent lifeforms around O and B stars?
A
O and B stars lifetimes are too short
