PRS Quesitons:
Answers are at the
end.
1) Which of these is
not a form of electromagnetic radiation?
A) television
signals
B) ultraviolet
causing a suntan
C) light from your
camp fire
D) DC current from
your car battery
E) x-rays in the
doctor's office
2) The speed of
light in a vacuum is written as:
A) h = E/c.
B) v = 186,000 miles
per hour.
C) v = 768 km/hour.
D) c = 300,000
km/sec.
E) not given
3) The radiation our
eyes are most sensitive to lies in the color:
A) blue at 4,321
nanometers.
B) yellow-green at
about 550 nm.
C) red at 6563
Angstroms.
D) black at 227 nm.
E) violet at 7,000
Angstroms.
4) The tendency of a
medium to block transmission of a certain wavelength of radiation is
referred to as its:
A) seeing.
B) opacity.
C) clarity.
D) transparency.
E) albedo.
5) Off the main sequence, Deneb is
a luminous hot supergiant, so it is class:
A)
M3V.
B)
A2Ia.
C)
B9V.
D)
M3Ib.
E)
K5V.
6) Which of these pairs of binaries
would appear most similar in color telescopically?
A)
F0V and G9III
B)
M1V and K9V
C)
A2Ia and F7Ia
D)
O2V and M4Ia
E)
F3IV and G8III
7)
Which temperature will freeze water?
1: 65° F
2: 5°
C
3: 263
K
8) Which
feels hotter?
1: 300°
F
2: 300°
C
3: 300°
K
9)
The relationship that the total energy radiated by a black body is
proportional
to T4 is attributed to? 1:
Bunsen 2:
Wien 3:
Kirchhoff 4:
Stefan 10)
What kind of spectrum do we see from the sun? A)
a continuum with no lines, as shown by the rainbow B)
a continuum with emission lines C)
only absorption lines on a black background D)
a continuum with absorption lines E)
only emission lines on a black background 11)
Which property of a black body is NOT true? A)
It appears black to us, regardless of its temperature B)
Its energy is in a continuum. C)
Its energy peaks at the wavelength determined by its temperature. D)
If its temperature is doubled, the peak in its curve would be halved in
wavelength. E)
If its temperature doubled, it would give off 16 times more total
energy. 12)
A pulsating variable star has a temperature ranging from 4000 K to 8000
K.
When it is hottest, each cm2 of
surface radiates how much more
energy? A)
(sqrt2)x more B)
2x more C)
4x more D)
16x more 13)
The element first found in the Sun’s spectrum and then on
Earth 30 years later
is… A)
hydrogen B)
helium C)
solarium D)
technicum 14)
A source of light is approaching us at 3,000 km/s.
All its waves are: A)
Red shifted by 1% B)
Blue shifted by 1% C)
Not affected, as c is constant in all reference frames. D)
Red shifted out of the visible into the infrared E)
Blue shifted out of the visible into the ultraviolet 15)
The temperature of the photosphere of the Sun is about: A)
4500 K B)
5800 K C)
11000 K D)
1 million K E)
15 million K 16
)The Sun’s average density is about the same as: A)
the Earth’s Moon B)
the Earth C)
Haley’s Comet D)
Jupiter E)
Saturn 17)
From inside out, which is the correct order? A)
core, convective zone, radiative zone B)
photosphere, radiative zone, corona C)
radiative zone, convective zone, chromosphere D)
core, chromosphere, photosphere E)
convective zone, radiative zone, granulation 18)
Typically, a granule in the photosphere of the sun is about the size of? A)
A city, ~20-30 kilometers across. B)
Texas, ~1000 km across. C)
The Moon, ~3000 km across. D)
The Earth, ~12,000 km across. E)
Jupiter, ~100,000 km across. 19)
What is the temperature of 150 C in Kelvin? A)
212 K B)
433 K C)
413 K D)
423 K E)
522 K 20)
A star's absolute magnitude is its apparent brightness as seen from: A)
Pluto. B)
Alpha Centauri. C)
10 light years distance. D)
33 light years distance. E)
100 parsecs distance. 21)
Which is correct 1
:
velocity x frequency = wavelength 2
:
velocity x period = wavelength 3
:
period x frequency = wavelength 4
:
velocity / period = wavelength 22)
A star of temperature 3,750K, just one step hotter than M (at 3,500),
would be a
related: A)
A9. B)
F5. C)
K9. D)
M1. E)
O3. 23)
A star emits the most energy at a wavelength of 5.8x10-5cm.
What is its temperature? A)
5800 K. B)
2000 K. C)
20000 K D)
0.29 K. E)
5000 K. 24)
What energy transport gets the energy of the gamma rays to the
Sun’s surface? A)
the transition zone B)
meson capture C)
the weak force D)
convection E)
prominences 25) The model
of
the atom with quantum leaps between electron orbitals is that of: A)
Albert Einstein. B)
Isaac Newton. C)
Neils Bohr. D)
Scott Bachula. E)
Wilhelm Kirchhoff. 26) That
electromagnetic radiation can behave not only as a wave, but as a
packet of
energy, or a photon, is due to: A)
Enrico Fermi. B)
Edward Teller. C)
Neils Bohr. D)
Isaac Newton. E)
Albert Einstein. 27) The
magnetic
fields of sunspots are studied by the splitting of their spectral lines
in the: A)
Doppler effect. B)
Stefan's law. C)
Zeeman effect. D)
Kirchhoffts third law. E)
Bohr model. 28) When we
glimpse
the chromosphere at the start and end of totality, its color is: A)
yellow, like the photosphere below it. B)
red, due to ionized hydrogen at lower pressure. C)
green (the famous flash). D)
blue, due to the ionization of nitrogen by the magnetic fields. E)
white from the moonlight. 29) The solar
winds
blow outward from: A)
the Sun's poles only. B)
flares. C)
the entire photosphere. D)
coronal holes. E)
sunspots. 30) In the
proton-proton cycle, the positron is: A)
an anti-electron. B)
the chief means energy reaches the photosphere. C)
a spin conservation particle. D)
massless. E)
intermediate between the proton and neutron in mass. 31) The most
striking example of solar variability was the: A)
Dust Bowl drought of the 1930s. B)
Sporer Minimum that doomed the Anasazi. C)
Joseph's seven lean years in the Old Testament. D)
Maunder Minimum from 1645-1715. E)
the fall of Rome. 32) The ESA
satellite which gave us our best parallax measurements is: A)
Huygens. B)
Cassini. C)
Giotto. D)
Hipparcos. E)
Copernicus. A)
The source is
approaching us at 6% of the speed of light. B)
The source is
receding from us at 6% of the speed of light. C)
The source is
receding from us at 1% of the speed of light. D)
The source is
approaching us at 1% of the speed of light. E)
The source is
getting 1% hotter as we watch. 34) A new
star is discovered.
If we observe it with blue and yellow filters (separately), and find
much more
yellow intensity than blue, where would you expect the peak wavelength
to be? A)
Red, or longer B)
Blue or shorter C)
Near the yellow D)
Not
enough information given. 35) If a
star was the same size as
our Sun, but was 16X more luminous, it must be: A)
three times
hotter than the Sun. B)
81 times hotter
than the Sun. C)
four times
hotter than the Sun. D)
nine times
hotter than the Sun. E)
twice as hot as
our Sun. 36) If a star
has a
parallax of .05", then its distance must be: A)
5 parsecs. B)
20 parsecs. C)
25 parsecs. D)
200 parsecs. E)
500 parsecs. 37) If your
naked
eye limiting magnitude is 6.0, then using a pair of small binoculars,
with about
15X the surface area of your pupil, which object would be near your new
limiting
magnitude? A)
seventh magnitude Titan, Saturn's largest moon B)
eighth magnitude Neptune C)
ninth magnitude Barnard's Star D)
eleventh magnitude Tethys, Saturn's second largest moon E)
thirteenth magnitude Pluto Key:
D D B B B
B
C B D D
A D B B B
D C B D D
B
C E D C
E C B D A
D D C A E B C Chapter
11 1) Why are
star clusters ideal
"laboratories" for stellar evolution? A)
Their
stars are all the same composition and stage in evolution. B)
The
combined light of all the stars makes them easier to see. C)
Their
stars are all about the same mass and temperature. D)
Their
stars are all about the same age, composition, and distance from us. E)
Like our
Sun, they lie in the plane of the Milky Way. 2) What
are the characteristics
of an open cluster? A)
no stars
left on the main sequence, but millions of white dwarfs B)
a few
hundred stars, most still on the main sequence C)
millions
of stars, both young and old, spread out over 100,000 ly. D)
a star
forming region, hundreds of light years across, with many blue main
sequence
stars E)
old age
and tens of thousands of stars 3) Which
is characteristic of
globular star clusters? A)
only brown
dwarfs in a yellow ball 100 ly across B)
bright
blue main sequence stars, and thousands of them C)
no
remaining main sequence stars, but millions of white dwarfs D)
old age
and hundreds of thousands of stars, only about 30 ly wide E)
a mix of
old and young stars, about 100,000 ly across 4) The
most common molecule in a
molecular cloud is: A)
carbon
monoxide, with one carbon and an oxygen. B)
ammonia,
with three hydrogens attached to a nitrogen. C)
molecular
hydrogen, made of two H atoms. D)
methane,
with four hydrogens around a hydrogen. E)
water,
with two hydrogens around an oxygen. 5) What
effect does even thin
clouds of dust have on light passing through them? A)
It dims
and reddens the light of all more distant stars. B)
Even a
little can completely block all light, such as the Horsehead Nebula. C)
Its motion
causes all light to be red shifted as it passes through these clouds. D)
Its motion
causes the light of stars beyond to twinkle. E)
The light
that passes through them is blue shifted due to the cloud's approach. 6)
Interstellar gas is composed
mainly of: A)
only
hydrogen. B)
some
hydrogen, but mainly carbon dioxide. C)
10%
hydrogen, 90% helium by numbers of atoms. D)
75%
hydrogen, 25% helium by weight. E)
ammonia,
methane, and water vapor. 7) Why are
dark dust clouds
largely misnamed? A)
The cloud
is an illusion, for the dust is evenly distributed around the Galaxy. B)
It is ice,
not dust, which make them look dark. C)
Dust
clouds do radiate energy, but not as much light as the stars do. D)
They
contain much more gas than dust. E)
All of the
above are correct. 8) Complex
molecules in the
inter-stellar medium are found: A)
uniformly
throughout the disk of the Galaxy. B)
only
around the supergiant stars like Betelguese that make their heavy atoms. C)
on the
surfaces of the coolest class K and M stars only. D)
scattered
evenly throughout the universe, a product of the Big Bang itself. E)
primarily
in the dense dust clouds. 9) A cloud
fragment too small to
collapse into a main sequence star becomes a: A)
pulsar. B)
brown
dwarf. C)
white
dwarf. D)
planet of
another star. E)
T Tauri
object. 10) How
long does it take an M
class star to reach the main sequence, compared to a solar type star? A)
a tenth as
long B)
longer
than the age of the Galaxy C)
about
twice as long D)
about
twenty times longer E)
about the
same, 30 million years D B D C A
D D E B D
Chapter 12
1) The helium flash converts helium nuclei into
A) carbon
B) beryllium
C) oxygen
D) iron
E) boron
2) Which is used observationally to determine the age of a star cluster?
A) the number of white dwarfs
B) the total number of main sequence stars
C) the amount of dust that lies around the duster
D) the ratio of giants to supergiants
E) the luminosity of the main sequence turn-off point
3) In a white dwarf, we have packed the mass of the Sun into the volume of:
A) the Moon.
B) Jupiter.
C) Eros.
D) Earth.
E) Mars.
4) The brightest stars in a young open cluster will be:
A) red T-tauri stars still heading for the main sequence.
B) yellow giants like our Sun, but much larger.
C) the core stars of planetary nebulae.
D) massive blue stars at the top left on the H-R diagram.
E) red giants that are fusing helium into carbon.
5) A relatively peaceful mass loss as a giant core becomes a white dwarf is a:
A) emission nebula.
B) nova.
C) supernova remnant.
D) planetary nebula.
E) supernova.
6) What forces a star like our Sun to evolve off the main sequence?
A) It loses all its neutrinos, so fusion must cease.
B) It completely runs out of hydrogen.
C) It builds up a core of inert helium.
D) It explodes as a violent nova.
E) It expels a planetary nebula to cool off and release radiation.
7) A surface explosion when a companion spills hydrogen onto its close white dwarf companion creates a:
A) nova.
B) Type I supernova.
C) emission nebula.
D) Type II supernova.
E) planetary nebula.
8) For a white dwarf to explode entirely as a Type I supernova, it must weigh:
A) 20 solar masses, the Hubble Limit.
B) at least 8% as much as the Sun.
C) 1.4 solar masses, the Chandrasekhar Limit.
D) 3 solar masses, the Schwartzchild Limit.
E) 100 solar masses, the most massive known stars.
9) Of the elements in your body, the only one not formed in stars is:
A) aluminum.
B) carbon.
C) hydrogen.
D) iron.
E) calcium.
10) Which of these events is not possible?
A) close binary stars producing recurrent novae explosions
B) white dwarfs and companion stars producing recurrent Type I supernova events
C) red giants exploding as Type II supernovae
D) a white dwarf being found in the center of a planetary nebula
E) low-mass stars swelling up to produce planetary nebulae
A E D D D C A C C B
Chapter 13
A) asteroid
B) white dwarf
C) neutron star
D) brown dwarf
2) If the Sun were replaced by a one solar mass black hole:
A) we would immediately escape into deep space, driven out by its radiation.
B) our clocks would all stop.
C) life here would be unchanged.
D) we would still orbit it in a period of one year.
E) all terrestrial planets would fall in immediately.
3) The largest known black holes
A) create the dark nebulae in the plane of the Milky Way.
B) can be no more than 1.4 solar masses, according to Chandrasekhar.
C) lie in the cores of the most massive galaxies.
D) can be no bigger than a small city, just like neutron stars.
E) can be no bigger than the earth, like white dwarfs.
4) Which of these does not exist?
A) a six solar mass black hole
B) a million solar mass black hole
C) a 1.8 solar mass neutron star
D) a .06 solar mass brown dwarf
E) a 1.5 solar mass white dwarf
5) While perhaps affected by rotation and magnetism, we think the lower limit for black holes is:
A) Hubble's limit of 30 solar masses.
B) Shapley's limit of 75 solar masses.
C) Chandrasekhar's limit of 1.4 solar masses.
D) Einstein's limit of 8 solar masses for high-mass stars.
E) Schwartzschild's limit of 3 solar masses.
6) Neutron stars have:
A) very strong bi-polar magnetic fields.
B) weak or non-existent magnetic fields.
C) periods of days or weeks.
D) monopolar fields that switch polarity every rotation.
E) no relation to pulsars.
C D C E E A