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Astro 103 Exam 1 Review Fall 2023 Flashcards | StudBud
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Astro 103 Exam 1 Review Fall 2023
Astro 103 Exam 1 Review Fall 2023
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1
What was unexpected about muons reaching the Earth's surface?
More muons reach the surface than expected.
The number of muons varies, depending on the date.
All muons decay before reaching the surface.
Muons aren't supposed to exist at all.
2
The solar eclipse event of 1919 proved that
gravity exists.
spacetime around the Sun is curved.
the speed of light is a constant.
Einstein's theory was wrong.
3
Spacetime has how many dimensions?
Four
Ten
Three
Infinite
4
According to Kepler, the orbits of the planets are
random.
epicyclic.
ellipses.
Circles
5
According to general relativity, gravity is
a force, like Newton said.
what happens when you move close to the speed of light.
fake.
due to the curvature of spacetime.
6
What's an implication of E=mc^2?
Energy cannot be created or destroyed.
The speed of light is constant.
Light is the same thing as energy.
Matter can be converted into energy.
7
Olbers' paradox asks the question
Why is the night sky dark?
Why is the speed of light constant?
How large is the Universe?
What is gravity?
8
In which kind of geometry would parallel lines eventually intersect?
Open (hyperbolic)
Closed (spherical)
Flat
All of these
9
Light was thought to move through something called the
ether.
inertia.
reference frame.
event horizon.
10
In an open geometry, the angles in a triangle add up to
less than 180 degrees.
more than 180 degrees.
exactly 180 degrees.
11
Where does nuclear fusion occur spontaneously?
In the ocean
In this room
Inside stars
At the center of the Earth
12
How can muons reach the surface, according to the Earth frame?
Muons have a shorter lifetime, according to the Earth frame.
Muons have a longer lifetime, according to the Earth frame.
Muons never decay because they move so fast.
Muons don't reach the surface.
13
What keeps an object moving at constant velocity?
Its weight
The ether.
Its inertia
A force
14
According to relativity, the speed of light
depends on how fast the ether "flows".
is slower the faster you move.
changes depending on your reference frame.
is always the same, in all reference frames.
15
Ptolemy explained retrograde motion by invoking
epicycles.
inertia.
elliptical orbits.
the ether.
16
What does mass do to spacetime?
It flattens spacetime.
It curves spacetime.
It does nothing to spacetime.
Can't say for sure -- it depends on the amount of mass.
17
A rocket is moving to the left. Which direction would its rocket need to fire in order to slow it down?
Down
Up
To the right
To the left
18
If the mass of one object triples, the gravitational force becomes
3 times weaker.
9 times larger.
3 times larger.
9 times weaker.
19
A 50-foot rocket moves away from the Earth. Who will measure the rocket to be shorter than 50 feet?
Unable to say
The person on the Earth
Both people
The person on the rocket
20
The equivalence principle says that you can't tell if you're accelerating or
moving at the speed of light.
at rest in empty space.
moving at constant velocity.
at rest in a gravitational field.
