AST 1002
Test 2, Spring 2005
QQ 1 Which of the following is characteristic of electromagnetic 
radiation regarded as consisting of particles?
AA S 1 (1) energy
(2) wavelength
(3) frequency
(4) spin
(5) NVA

QQ 2 Which of the following kinds of electromagnetic radiation has 
the lowest energy?
AA S 1 (1) radio waves
(2) gamma rays
(3) X-rays
(4) NVA
(5) NVA

QQ 3 Which color of visible light is associated with the longest 
wavelength?
AA S 1 (1) red
(2) yellow
(3) violet
(4) NVA
(5) NVA

QQ 4 A glowing solid has which type of spectrum?
AA S 1 (1) continuous
(2) emission-line (bright-line)
(3) absorption-line (dark-line)
(4) NVA
(5) NVA

QQ 5 According to Wien's Law, if an ideal radiator's temperature 
is doubled, the wavelength at which it has its maximum intensity 
will
AA S 1 (1) be cut in half
(2) double
(3) increase by a factor $2^4=16$
(4) NVA
(5) NVA

QQ 6 According to the Stefan-Boltzmann Law, if an ideal radiator's 
temperature is doubled its energy output per unit area per unit 
time is 
AA S 1 (1) increased by a fator $2^4=16$
(2) doubled
(3) cut in half
(4) NVA
(5) NVA

QQ 7 An emission line is produced by a lot of atoms in which 
electrons are 
AA S 1 (1) falling from a particular higher energy level to a 
particular lower one
(2) absorbing photons and using the energy to climb from a particular 
lower energy level to a particular higher one
(3) falling into the nuclei of those atoms
(4) NVA
(5) NVA

QQ 8 The spectrum (i.e., the set of emission/absorption lines) of 
a given ionization stage of a given element, e.g. neutral 
helium, is 
AA S 1 (1) different from that for ionized helium 
(2) the same as that for ionized helium but different from that 
for hydrogen
(3) indistinguishable from that of any other element
(4) NVA
(5) NVA

QQ 9 Singly ionized hydrogen (symbol H) is represented by 
AA S 1 (1) H II
(2) H I
(3) Hi
(4) NVA
(5) NVA

QQ 10 As a gas is heated up so that the temperature increases, 
the degree to which the gas is ionized (assuming everything else, 
such as pressure, doesn't change) 
AA S (1) increases
(2) decreases
(3) is unaffected
(4) NVA
(5) NVA

QQ 11 Which kinds of energy levels can molecules have?
AA S 1 (1) electronic, vibrational, and rotational
(2) electronic and rotational but not vibrational 
(3) electronic only
(4) NVA
(5) NVA

QQ 12 If a source of emission-line electromagnetic radiation is 
approaching the observer, the Doppler shift, in this case a 
"blueshift," shifts the line's wavelength 
AA S 1 (1) to a smaller value
(2) to a larger value 
(3) into the blue part of the visible-light spectrum
(4) NVA
(5) NVA

QQ 13 The kind of aberration in which light rays of different 
colors are brought to a focus at different distances from 
the lens is termed
AA S 1 (1) chromatic aberration
(2) spherical aberration
(3) coma
(4) NVA
(5) NVA

QQ 14 The type of reflector having a convex secondary that 
reflects light rays from the primary mirror through a hole 
in that mirror to a focus is the 
AA S 1 (1) Cassegrain
(2) Newtonian
(3) Coude
(4) NVA
(5) NVA

QQ 15 The instrument used with the telescope to spread out the 
spectra of astronomical objects by wavelength for analysis is 
the 
AA S 1 (1) spectrograph
(2) photometer
(3) eyepiece
(4) NVA
(5) NVA

QQ 16 In which of the following regions of the electromagnetic 
spectrum is the Earth's atmosphere most transparent?
AA S 1 (1) radio
(2) X-ray
(3) ultraviolet
(4) NVA
(5) NVA

QQ 17 The best solution to the resolution problem in radio 
astronomy is the 
AA S 1 (1) very long baseline interferometer array
(2) two-element interferometer
(3) very large single dish
(4) NVA
(5) NVA

QQ 18 Which of the following is a jovian planet?
AA S 1 (1) Neptune
(2) Pluto
(3) Mars
(4) NVA
(5) NVA

QQ 19 Which of the following is characteristic of terrestrial 
planets?
AA S 1 high average (=mean) density
(2) numerous moons
(3) large mass
(4) NVA
(5) NVA

QQ 20 The reason why the binary or encounter hypothesis finally 
was ruled out is because 
AA S 1 (1) hot gas pulled from the Sun would disperse, not 
condense into planets
(2) the Sun's rotation today is too slow for a disk to have 
been produced (angular momentum problem)
(3) such a close encounter of two stars is impossible
(4) NVA
(5) NVA

QQ 21 Which of the following is a refractory substance that 
could have condensed out in the hot inner part of the 
protoplanetary disk in the young Solar System?
AA S 1 (1) metal such as iron
(2) water
(3) hydrogen
(4) NVA
(5) NVA

QQ 22 The "frost line" in the early Solar System is 
located at the minimum distance where
AA S 1 (1) volatiles could condense out
(2) gases such as hydrogen and helium could condense out
(3) accretion of small particles to build larger ones could 
occur
(4) NVA
(5) NVA

QQ 23 The maria on the Moon were formed 
AA S 1 (1) in the late bombardment period, when the Moon was 
struck by a few very large objects
(2) the early bombardment period, when the Moon was struck by 
very many objects of relatively small size
(3) very recently, within the last half-billion years
(4) NVA
(5) NVA

QQ 24 The currently accepted theory of the Moon's origin is 
that it 
AA S 1 (1) was formed from material blasted out of Earth by the 
impact of a very large planetesimal (giant impact theory)
(2) split off from the Earth when it was molten and became 
unstable (fission theory)
(3) was captured when it passed close to the Earth and was slowed 
down by tidal friction (capture theory)
(4) NVA
(5) NVA

QQ 25 Which is currently the least effective way to detect a 
planet orbiting a star other than the Sun?
AA S 1 (1) directly, by seeing a faint light near the star
(2) directly, by seeing the star's light dim slightly when the 
planet {\it transits}, or crosses in front of the star
(3) indirectly, by measuring the variation in the star's radial 
velocity caused by its orbiting around the center of mass 
(in response to the palnet's gravitational pull)
(4) NVA
(5) NVA

QQ 26 The process by which the Earth came to have a dense metal 
core and a less dense rock mantle is termed 
AA S 1 (1) differentiation
(2) conduction
(3) the dynamo mechanism
(4) NVA
(5) NVA

QQ 27 The Earth's magnetic field, which left to itself would 
resemble that of a bar magnet, is compressed on the side facing 
the Sun and stretched out away from the Sun on the other side by 
AA S 1 (1) the solar wind
(2) solar radiation pressure
(3) the Sun's gravity
(4) NVA
(5) NVA

QQ 28 Which of the following is the least active, geologically 
speaking?
AA S 1 (1) Mercury
(2) Mars 
(3) Earth
(4) NVA
(5) NVA

QQ 29 Considering the way a planet's atmosphere can lose gases 
by the thermal escape process, which kind of planet is least 
likely to keep an atmosphere?
AA S 1 (1) hot, low escape velocity
(2) cold, low escape velocity
(3) hot, high escape velocity
(4) NVA
(5) NVA

QQ 30 Which planet has the strongest greenhouse effect?
AA S 1 (1) Venus
(2) Earth
(3) Mars
(4) NVA
(5) NVA

QQ 31 Which of the following is not evidence of water on Mars?
AA S 1 (1) the canals discovered by Schiaparelli
(2) the permanent part of the Martian polar cap
(3) the "braided channels"
(4) NVA
(5) NVA

QQ 32 The term differential rotation in connection with 
Jupiter refers to 
AA S 1 (1) the rotation period's being different at different 
latitudes
(2) the rotation of the Great Red Spot relative to the surrounding 
clouds
(3) the rotation period's random fluctuations
(4) NVA
(5) NVA

QQ 33 Hydrostatic equilibrium refers to the balance between 
AA S 1 (1) the inward pull of gravity and the outward push of 
pressure difference
(2) the inward pull of gravity and the outward push of 
centrifugal "force"
(3) the inward pull of the magnetic force and the outward push of 
gravity
(4) NVA
(5) NVA