Astro Exam 2
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School
CUNY Queens College *
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Course
101
Subject
Astronomy
Date
Dec 6, 2023
Type
Pages
5
Uploaded by BaronSeahorsePerson1634
1)
To what spectral class does this spectrum belong?
-
A, since it has many neutral metal lines.
A, since it has strong hydrogen lines.
M, since it has many neutral metal lines.
F, since it has many neutral metal and hydrogen lines.
A, since it has one ionized metal line but no neutral
2) This table lists some stars and some other their characteristics. Which star
has the greatest luminosity?
Thuban
Alpha Centauri A
Altair
Barnard's Star
3) Suppose you've just discovered that bursts of gamma radiation are coming
from random points in the sky. What would that tell you about how far away
they are?
a. The fact that bursts of gamma radiation come from random
points in the sky does not provide direct information about how far away
they are.
4) Suppose that a star has prominent neutral Ca (calcium) lines in its
spectrum. This star(1 Point)
D. must be an F type star, since these stars
have very prevalent metal lines
5) If the Moon were 1 mile from Earth, how far from the Earth would Mars be
(in terms of the practical distance one must travel to get there)?
100 miles
6) The Moon’s mass is 0.0123 of Earth’s, and its radius is 0.2727 of Earth’s.
The surface gravity on the Moon (g_m) divided by that on Earth (g_E) is
⅙
of the earths surface
7) Suppose that you are taken aboard a Romulan (an alien race from Star
Trek) ship, and asked to determine the stellar classification of a star. The
Romulans tell you that the spectrum has strong neutral and ionized metal
lines. Which of the following replies would be an appropriate answer?
"The
star is very likely a G type."
8) This table lists some stars and some other their characteristics. Which star
has the hottest surface temperature?Thuban
9)
Alpha Centauri A
Thuban
Altair
Barnard's Star
10)
What distinguishes Pluto from the eight planets is
It hasn’t cleared
itself from the orbit
11)
One of the challenges that astronauts will not face in going to Mars is
C.
The high radiation on the surface of Mars
12)
Here, we have a stellar spectrum and a table of spectral lines. Which
statement about this stellar spectrum is true?
b) The spectrum must be
from a relatively hot star, but not quite as hot as an O-type star.
13)
Different stars have different spectra because
C. although the stars are
mostly made up of the same elements, the surface temperatures of stars
vary widely
14)
The luminosity of a star is proportional to its
b. The luminosity of a star is
proportional to its surface area
,
15)
Suppose that you wanted to send a spacecraft(s) to the nearest solar
system to Earth using a light sail; would you wish to use Sunlight?
a
. Yes,
using sunlight to power a light sail would be a good option for a spacecraft
intended to travel to the nearest solar system to Earth. This is because the
Sun is the most powerful source of light in our solar system, and using
sunlight to power a light sail would allow the spacecraft to continuously
accelerate and reach high speeds over time.
16)
During Weekly Pondering 4, we discussed (among other things)
(IGNOREE)
17)
A very distant star that emits as much light as the Sun
18)
Let's consider Activity III. If you were to list the 25 brightest stars in the
night sky, (please select all that apply)
b. the Sun would have a relatively
average absolute magnitude.
19)
Which of the following is not a reason to study spectra in astronomy?
a.
The three different types of spectra are emission, continuous, and
absorption.
20)
Star A and star B have absolute magnitudes of 4.0 and 6.0, respectively,
but both stars have apparent magnitudes of -1.0. Which statement below is
correct?
C) Star A and star B appear to have the same brightness, but star
A is intrinsically brighter than star B.
21)
Other than Earth, the best-studied planet is
D. mars, since there is good
evidence that it was relatively Earth-like in its early history
22)
Which of the following statements about luminosity and apparent
brightness is correct?
(B) The luminosity of a star depends upon
23)
This table lists some stars and some other their characteristics. Which star
is the farthest one from Earth?
Altair
Thuban
Barnard's Star
Alpha Centauri A
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24)
In the list of the 25 brightest stars on the H-R diagram,
25)
Which of the following statements about Mars is correct?
A. The surface of
mars has substantially greater radiation levels compared to the surface of
Earth
26)
What is true of Mars?
Iron oxide on the surface
27)
How might you distinguish between an O type and a G type star?
D. The O
type star has no metal lines, whereas the G type star will have many neutral
and ionized metal lines
The Moon’s mass is 0.0123 of Earth’s, and its radius is 0.2727 of Earth’s. The
surface gravity on the Moon (g_m) divided by that on Earth (g_E) is
a small number, since the Moon is so small.
a large number since, although the radius of the Moon is about a quarter that of Earth, the Moon's
mass is far smaller.
a small number, since, although the radius of the Moon is about a quarter that of Earth, the Moon's
mass is only 1% that of Earth.
a small number, since the radius of the Moon is about a quarter that of Earth, and the mass of the
Moon doesn't make much of a difference.
One of the challenges that astronauts will not face in going to Mars is
the force from the solar wind that will push the craft into the outermost parts of the solar system.
irradiation with very high-energy protons.
that tiny pieces of rock might destroy the craft.
the high radiation on the surface of Mars. ←-- i think its this(yes it is)
During Weekly Pondering 4, we discussed (among other things)(1 Point)
how to use the Drake Equation to calculate the number of extraterrestrial civilizations, which is about
10,000.
how to take a very complex problem, such as the problem of determining the number of
extraterrestrial civilizations, and break it down into more manageable components.
how Sara Seager used the Drake Equation to determine that the number of extraterrestrial
civilizations is actually about 5,000.
i