PSU Astro 7N Exam 1
What two properties of a planet affect the gravity we feel on its surface? - Mass and
radius
Two planets have the same radius. If Planet A is 5 times more mass than Planet B,
how does gravity differ on the surfaces of the two planets? - Gravity is 5 times
stronger on planet A
Say that there were a planet X in our Solar System with a mass 1/4 the mass of
Earth and a radius 1/2 the radius of Earth. How will the gravity on its surface
compare to the surface gravity of Earth? - Surface gravity on planet X is the same as
on earth
A planet in a nearly circular orbit with its rotation axis tilted by 5 degrees relative to
its orbital plane around its star would ... - Have seasons that are not very different
from each other as compared to Earth
The rotation axis of the Earth is ... - Tilted at about 23 degrees relative to the axis of
the Earth's orbit around the Sun
In the diagram above, what season and planet is being represented by the red X on
the planet on the left in orbit around the Sun? -
When is the waning gibbous moon highest in the sky? - About 3 am
What phase is the Moon in, when observed by the person standing on the Earth in
the diagram above? - New
At what time will the Moon set on the day of a Solar eclipse? - Sunset
Stars that are in the same constellation ... - are likely to be at very different distances
from us.
The "North Star" is a star in the constellation of Ursa Minor, which lies just above the
North pole of Earth. Which of the following is true? - Ursa Minor is a Zodiac
constellation in the summer but not in the winter
A particular Zodiac constellation is high in the sky at midnight in April. Where will it
be in October? - Near the Sun in the daytime sky
What do you expect the spectrum of an object that is 1,000,000 Kelvin to be like? - It
should peak at X-ray wavelengths
, As compared to a cool star, a hotter star emits ... - Shorter wavelength, higher
frequency, bluer color
Radio waves can travel large distances without interference because ... - They have
longer wavelengths than visible light
Compared to ultraviolet radiation, X-rays have a wavelength that is ... - Shorter
Star A is 4000 K, and Star B is 8000 K. Which of the following is true? - The color of
Star A is redder than Star B
In the diagram above, what is happening in the box in the center? -
A star is a hot, dense gas surrounded by a cooler, low density atmosphere. What
type of spectrum will a star create? - Absorption Spectrum
What makes a transition from a lower energy state to a higher energy state when a
photon is absorbed into an atom? - Electron
An emission line is produced when: - An electron passes from a higher to a lower
energy level
Bright lines in an emission spectrum represent: - particular energies of light that are
emitted from a distant object
The faintness of an object that a telescope can observe is mostly determined by the
... - Diameter of the opening of a telescope
In what ways does a 5 meter telescope outperform a 1 meter telescope?I - its
images are 25 times brighter than a 1 meter
A mountain top is a good location for optical telescopes because the site ... - Is
above much of the atmosphere
Which statement about the rotation of the Inner planets is true? - Venus rotates in
the opposite direction from the three other inner planets
Which of the following is TRUE? - Mercury rotates exactly one and a half times for
every one revolution around the Sun.
Why do the orbits of the planets all lie in nearly the same plane? - The early solar
nebula flattened into a disk.
What two properties of a planet affect the gravity we feel on its surface? - Mass and
radius
Two planets have the same radius. If Planet A is 5 times more mass than Planet B,
how does gravity differ on the surfaces of the two planets? - Gravity is 5 times
stronger on planet A
Say that there were a planet X in our Solar System with a mass 1/4 the mass of
Earth and a radius 1/2 the radius of Earth. How will the gravity on its surface
compare to the surface gravity of Earth? - Surface gravity on planet X is the same as
on earth
A planet in a nearly circular orbit with its rotation axis tilted by 5 degrees relative to
its orbital plane around its star would ... - Have seasons that are not very different
from each other as compared to Earth
The rotation axis of the Earth is ... - Tilted at about 23 degrees relative to the axis of
the Earth's orbit around the Sun
In the diagram above, what season and planet is being represented by the red X on
the planet on the left in orbit around the Sun? -
When is the waning gibbous moon highest in the sky? - About 3 am
What phase is the Moon in, when observed by the person standing on the Earth in
the diagram above? - New
At what time will the Moon set on the day of a Solar eclipse? - Sunset
Stars that are in the same constellation ... - are likely to be at very different distances
from us.
The "North Star" is a star in the constellation of Ursa Minor, which lies just above the
North pole of Earth. Which of the following is true? - Ursa Minor is a Zodiac
constellation in the summer but not in the winter
A particular Zodiac constellation is high in the sky at midnight in April. Where will it
be in October? - Near the Sun in the daytime sky
What do you expect the spectrum of an object that is 1,000,000 Kelvin to be like? - It
should peak at X-ray wavelengths
, As compared to a cool star, a hotter star emits ... - Shorter wavelength, higher
frequency, bluer color
Radio waves can travel large distances without interference because ... - They have
longer wavelengths than visible light
Compared to ultraviolet radiation, X-rays have a wavelength that is ... - Shorter
Star A is 4000 K, and Star B is 8000 K. Which of the following is true? - The color of
Star A is redder than Star B
In the diagram above, what is happening in the box in the center? -
A star is a hot, dense gas surrounded by a cooler, low density atmosphere. What
type of spectrum will a star create? - Absorption Spectrum
What makes a transition from a lower energy state to a higher energy state when a
photon is absorbed into an atom? - Electron
An emission line is produced when: - An electron passes from a higher to a lower
energy level
Bright lines in an emission spectrum represent: - particular energies of light that are
emitted from a distant object
The faintness of an object that a telescope can observe is mostly determined by the
... - Diameter of the opening of a telescope
In what ways does a 5 meter telescope outperform a 1 meter telescope?I - its
images are 25 times brighter than a 1 meter
A mountain top is a good location for optical telescopes because the site ... - Is
above much of the atmosphere
Which statement about the rotation of the Inner planets is true? - Venus rotates in
the opposite direction from the three other inner planets
Which of the following is TRUE? - Mercury rotates exactly one and a half times for
every one revolution around the Sun.
Why do the orbits of the planets all lie in nearly the same plane? - The early solar
nebula flattened into a disk.
