Exam 3

A  45 x 10-4
3.2 x 104

B  4.5 x 103
32 x 103

C  4.5 x 10-3
3.2 x 104

D  4.5 x 10-4
32 x 103

A  TRUE

B  FALSE

A  move faster than lower-energy photons.

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

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

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

E  have more mass than lower-energy photons.

A  TRUE

B  FALSE

A  an eclipsing binary

B  a spectroscopic binary

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

D  a visual binary

E  an astrometric binary

A  FALSE

B  TRUE

A  FALSE

B  TRUE

A  farther

B  closer

C  the same distance

D  now way to tell with available data

A  FALSE

B  TRUE

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

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

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

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

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

A  oscillatory (wobbly) star motions

B  2 visible stars orbiting each other

C  converging spectral lines

D  varying star intensities

A  FALSE

B  TRUE

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

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

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

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

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  Uranus

B  Venus

C  Io

D  Triton

A  differential rotation, winding up the magnetic fields

B  granulation oscillations

C  nuclear explosions

D  a constant dipole magnetic field

E  the Zeeman effect and the Maunder minimum

A  FALSE

B  TRUE

A  an ion

B  a neutron

C  a photon

D  a proton

E  an electron

A  distance

B  mass

C  core temperature

D  expansion/contraction

A  TRUE

B  FALSE

A  Electrons have discrete energy levels.

B  Photon emission occurs randomly, in any direction.

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

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

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

A  TRUE

B  FALSE

A  open clusters

B  Mira clusters

C  megaclusters

D  globular clusters

E  elliptical galaxies

A  away from us

B  not speed, but energies due to temperature

C  across the field of view

D  toward us

A  TRUE

B  FALSE

A  Hydrogen normally has one neutron.

B  Hydrogen normally has one proton.

C  Normal hydrogen is also called protium.

D  Hydrogen normally has one electron.

A  TRUE

B  FALSE

A  Earth

B  Uranus

C  Venus

D  Mars

A  FALSE

B  TRUE

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

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

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

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 10 ps from Earth.

D  Sirius is located greater then 10 ps from Earth.

A  TRUE

B  FALSE

A  4

B  16

C  1/4

D  1/16

A  8

B  7

C  10

D  18

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

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

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

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

A  electrons

B  neutrons

C  protons

D  Bohr model

E  valence shields

A  emitted intensity

B  photosphere temperature

C  speed of light

D  fusion density

E  core temperature

A  FALSE

B  TRUE

A  brown giants

B  long period variables

C  binary stars

D  Cepheids

A  green

B  white

C  red

D  blue

A  young (< millions of years)

B  5 billion years

C  > 10 billion years

A  FALSE

B  TRUE

A  FALSE

B  TRUE

A  sunspots and heliosiesmology are associated with the photosphere

B  the corona is the solar wind

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

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

A  temperature

B  gravity

C  pressure

D  mass

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

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

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

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

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

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

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

C  It is an isotope of hydrogen.

D  It has one neutron and one proton.