Exam 3

A  4.5 x 10-4
32 x 103

B  4.5 x 103
32 x 103

C  45 x 10-4
3.2 x 104

D  4.5 x 10-3
3.2 x 104

A  FALSE

B  TRUE

A  have more mass than lower-energy photons.

B  have higher frequencies and shorter wavelengths than lower-energy photons.

C  travel less distance between their source and the observer than lower-energy photons.

D  move faster than lower-energy photons.

E  are not as likely to become redshifted as lower-energy photons.

A  TRUE

B  FALSE

A  an astrometric binary

B  a spectroscopic binary

C  an eclipsing binary

D  a visual binary

E  impossible, unless at least one of the two stars if itself intrinsically variable.

A  TRUE

B  FALSE

A  FALSE

B  TRUE

A  closer

B  farther

C  the same distance

D  now way to tell with available data

A  TRUE

B  FALSE

A  the relatively cool outer layers absorb photons emitted in the hot inner parts of the Sun, producing absorption lines.

B  the coronal mass ejections interfere with the photons, adding too much noise to the spectrum.

C  its core is much hotter than its surface, so the shape of the curve is distored.

D  its spectrum consists of emission lines of the elements in the Sun, so there are some gaps.

E  the Sun is too hot to radiate at all wavelengths.

A  varying star intensities

B  oscillatory (wobbly) star motions

C  converging spectral lines

D  2 visible stars orbiting each other

A  FALSE

B  TRUE

A  An explosion throws out mass that settles as a star.

B  Gravity causes a cloud of gas & dust to collapse toward a center.

C  A large gas ball spins out of a larger star when disrupted by a passing star.

D  Dark clouds hide large gas balls that are ignited by passing stars.

A  with extra electrons

B  with extra neutrinos

C  with extra protons

D  with extra neutrons

A  proton-proton chain

B  triple alpha process

C  nucleosynthesis

D  carbon-nitrogen-oxygen cycle

A  Io

B  Triton

C  Uranus

D  Venus

A  the Zeeman effect and the Maunder minimum

B  nuclear explosions

C  a constant dipole magnetic field

D  granulation oscillations

E  differential rotation, winding up the magnetic fields

A  TRUE

B  FALSE

A  a photon

B  an ion

C  a neutron

D  an electron

E  a proton

A  core temperature

B  expansion/contraction

C  mass

D  distance

A  TRUE

B  FALSE

A  Electrons have discrete energy levels.

B  Photon emission occurs randomly, in any direction.

C  Absorption occurs when an electron in an atom jumps from a lower energy level to a higher energy level.

D  Each element produces a unique pattern of spectral lines, like a fingerprint.

E  An electron in an atom may absorb either part or all of the energy of a photon.

A  FALSE

B  TRUE

A  megaclusters

B  elliptical galaxies

C  open clusters

D  Mira clusters

E  globular clusters

A  across the field of view

B  not speed, but energies due to temperature

C  away from us

D  toward us

A  TRUE

B  FALSE

A  Normal hydrogen is also called protium.

B  Hydrogen normally has one proton.

C  Hydrogen normally has one neutron.

D  Hydrogen normally has one electron.

A  TRUE

B  FALSE

A  Earth

B  Mars

C  Venus

D  Uranus

A  FALSE

B  TRUE

A  their thick gaseous atmospheres would disintegrate any small rock that enter them

B  tidal forces cause volcanic eruptions on some moons, and part of this material subsequently escaped the gravity of the moons, forming the rings.

C  Jovian planets rotate very rapidly, and some material near the equator of these planets was flung outward, forming the rings

D  tidal forces prevent the material in rings from forming into moons

E  there is too much material to have fit into the ball of each planet

A  Sirius is located less than 10 ps from Earth.

B  This is an impossible situation. The apparent magnitude can’t be more than the absolute magnitude.

C  Sirius is located greater then 10 ps from Earth.

D  Sirius is located 10 ps from Earth.

A  TRUE

B  FALSE

A  16

B  4

C  1/16

D  1/4

A  18

B  7

C  8

D  10

A  Gravitational contraction of a pre-main-sequence star ceases once nuclear reaction begin.

B  Contracting balls of gas with masses below about 75 Jupiter masses actually end up as brown dwarfs, not main-sequence stars.

C  During gravitational contraction, the temperature in the core of a pre-main-sequence star decreases.

D  Stars form from gaint clouds of gas and dust whose collapse and fragmentation (clumping) are due to gravity.

A  electrons

B  Bohr model

C  protons

D  neutrons

E  valence shields

A  speed of light

B  core temperature

C  emitted intensity

D  photosphere temperature

E  fusion density

A  FALSE

B  TRUE

A  brown giants

B  Cepheids

C  binary stars

D  long period variables

A  green

B  red

C  white

D  blue

A  5 billion years

B  young (< millions of years)

C  > 10 billion years

A  FALSE

B  TRUE

A  TRUE

B  FALSE

A  the chromosphere is best viewed with a H-alpha filter

B  the corona is the solar wind

C  sunspots and heliosiesmology are associated with the photosphere

D  a photo of the Sun with a x-ray filter will show the chromoshere

A  mass

B  gravity

C  temperature

D  pressure

A  space; the deformation of the glass due to the absence of gravity.

B  refracting; the smearing of light due to atmospheric turbulence.

C  refracting; different focal lengths for different wavelengths of light.

D  reflecting; the smearing of light due to atmospheric turbulence.

E  reflecting; differing focal points from different parts of the mirror.

A  It has one neutron and one proton.

B  It has one more proton than an average hydrogen atom.

C  It has one electron, so it is not an ion.

D  It is an isotope of hydrogen.