Astro1 UCSB Final Exam 320 QUESTIONS AND WELL ELABORATED
ANSWERS 2025 GRADED A {3VERSIONS}
When the Moon is a thin crescent , what is the phase of Earth as seen
from the Moon? - CORRECT ANSWER A mostly full (gibbous) Earth.
You are on the equator, where is Polaris? - CORRECT ANSWER North
on the horizon.
What is Europa's period? - CORRECT ANSWER Double Io's. 3.54 days.
What do we call materials that condense and vaporize at temperatures
near room temperature? - CORRECT ANSWER Ices
What happens to your mass and weight on Mars as compared to Earth?
- CORRECT ANSWER Weight becomes less, mass stays the same.
Why is it warmer in the summer than in the winter? - CORRECT
ANSWER The Sun is higher in the sky and the days are longer.
The Earth's shadow falling on the Moon is the reason we see what? -
CORRECT ANSWER Lunar Eclipses
Hot transparent clouds of Hydrogen give off what type of spectrum? -
CORRECT ANSWER A series of emission lines spaced in a
mathematical sequence.
Which is false?
-A theory is tested through its implicit predictions.
-A theory is like a law of physics that is speculative.
-Our intuition is not always a good guide to physics.
-Logic has always worked in the study of physics. - CORRECT
ANSWER A theory is like a law of physics that is speculative.
,What is the "observable universe"? - CORRECT ANSWER Everything
within the cosmic horizon.
The "G" in Newton's law of universal gravitation is? - CORRECT
ANSWER It is a constant throughout all observable space and time.
How strong is the gravitational force that acts on an astronaut in
circular orbit above Earth's surface? - CORRECT ANSWER Almost as
strong as when the astronaut is standing on the surface of the Earth.
What does the Doppler effect state? - CORRECT ANSWER The
wavelength of light is shifted to a shorter wavelength if the source of
light is moving toward you.
What did Galileo conclude about Venus? - CORRECT ANSWER Venus
orbits the Sun.
Which is correct?
-The supernova in the Andromeda galaxy occurred before the one in
M82.
-Both stars exploded at the same time.
-The supernova in the Andromeda galaxy occurred after the one in
M82.
-We cannot tell which star exploded first. - CORRECT ANSWER The
supernova occurred after.
What is the angular diameter of the Moon? - CORRECT ANSWER 10^-
3 arcseconds.
Consider the Sun and Moon have similar angular sizes but the Sun is
about 400 times further. What factor must the Sun be larger than the
moon by? - CORRECT ANSWER 400x
If the temp of a block of iron is raised from 500K to 1000K, the total
amount what energy emitted by the block will increase by what
factor? - CORRECT ANSWER 16
, How much blackbody energy does the Earth radiate into space? -
CORRECT ANSWER 4πR...
Which effect has been useful and successful in the search and
identification of black holes? - CORRECT ANSWER Their gravitational
influence on nearby matter, particularly companion stars.
What is a planetary nebula? - CORRECT ANSWER An expanding gas
shell expanding around a white hot dwarf star.
True or False: We know that the sun is extremely hot inside because of
the pressure needed to
keep it from collapsing because of gravity (Hydrostatic equilibrium) as
well as the
fact that the density is relatively low. - CORRECT ANSWER True
True or False: It is possible to produce energy by fusion of light
elements. - CORRECT ANSWER True
True or False: It is possible to produce energy by the fusion of heavy
elements - CORRECT ANSWER False
True or False: Massive stars have longer lives because they start with
a greater fuel supply. - CORRECT ANSWER False
True or False: Neutron stars are held up by neutron degeneracy
pressure, but above about 2.5
Mo, this force give out and the neutron star collapses. - CORRECT
ANSWER True
True or False: We detect and find the mass of the Supermassive Black
Hole in the center of our
Milky Way galaxy because we can see the nearby stars whipping
around it in their
orbits. - CORRECT ANSWER True
True or False: A puzzle about Einstein's theory of gravity is how one
body can attract another
ANSWERS 2025 GRADED A {3VERSIONS}
When the Moon is a thin crescent , what is the phase of Earth as seen
from the Moon? - CORRECT ANSWER A mostly full (gibbous) Earth.
You are on the equator, where is Polaris? - CORRECT ANSWER North
on the horizon.
What is Europa's period? - CORRECT ANSWER Double Io's. 3.54 days.
What do we call materials that condense and vaporize at temperatures
near room temperature? - CORRECT ANSWER Ices
What happens to your mass and weight on Mars as compared to Earth?
- CORRECT ANSWER Weight becomes less, mass stays the same.
Why is it warmer in the summer than in the winter? - CORRECT
ANSWER The Sun is higher in the sky and the days are longer.
The Earth's shadow falling on the Moon is the reason we see what? -
CORRECT ANSWER Lunar Eclipses
Hot transparent clouds of Hydrogen give off what type of spectrum? -
CORRECT ANSWER A series of emission lines spaced in a
mathematical sequence.
Which is false?
-A theory is tested through its implicit predictions.
-A theory is like a law of physics that is speculative.
-Our intuition is not always a good guide to physics.
-Logic has always worked in the study of physics. - CORRECT
ANSWER A theory is like a law of physics that is speculative.
,What is the "observable universe"? - CORRECT ANSWER Everything
within the cosmic horizon.
The "G" in Newton's law of universal gravitation is? - CORRECT
ANSWER It is a constant throughout all observable space and time.
How strong is the gravitational force that acts on an astronaut in
circular orbit above Earth's surface? - CORRECT ANSWER Almost as
strong as when the astronaut is standing on the surface of the Earth.
What does the Doppler effect state? - CORRECT ANSWER The
wavelength of light is shifted to a shorter wavelength if the source of
light is moving toward you.
What did Galileo conclude about Venus? - CORRECT ANSWER Venus
orbits the Sun.
Which is correct?
-The supernova in the Andromeda galaxy occurred before the one in
M82.
-Both stars exploded at the same time.
-The supernova in the Andromeda galaxy occurred after the one in
M82.
-We cannot tell which star exploded first. - CORRECT ANSWER The
supernova occurred after.
What is the angular diameter of the Moon? - CORRECT ANSWER 10^-
3 arcseconds.
Consider the Sun and Moon have similar angular sizes but the Sun is
about 400 times further. What factor must the Sun be larger than the
moon by? - CORRECT ANSWER 400x
If the temp of a block of iron is raised from 500K to 1000K, the total
amount what energy emitted by the block will increase by what
factor? - CORRECT ANSWER 16
, How much blackbody energy does the Earth radiate into space? -
CORRECT ANSWER 4πR...
Which effect has been useful and successful in the search and
identification of black holes? - CORRECT ANSWER Their gravitational
influence on nearby matter, particularly companion stars.
What is a planetary nebula? - CORRECT ANSWER An expanding gas
shell expanding around a white hot dwarf star.
True or False: We know that the sun is extremely hot inside because of
the pressure needed to
keep it from collapsing because of gravity (Hydrostatic equilibrium) as
well as the
fact that the density is relatively low. - CORRECT ANSWER True
True or False: It is possible to produce energy by fusion of light
elements. - CORRECT ANSWER True
True or False: It is possible to produce energy by the fusion of heavy
elements - CORRECT ANSWER False
True or False: Massive stars have longer lives because they start with
a greater fuel supply. - CORRECT ANSWER False
True or False: Neutron stars are held up by neutron degeneracy
pressure, but above about 2.5
Mo, this force give out and the neutron star collapses. - CORRECT
ANSWER True
True or False: We detect and find the mass of the Supermassive Black
Hole in the center of our
Milky Way galaxy because we can see the nearby stars whipping
around it in their
orbits. - CORRECT ANSWER True
True or False: A puzzle about Einstein's theory of gravity is how one
body can attract another
