Exam 3

A  4.5 x 10-4
32 x 103

B  4.5 x 103
32 x 103

C  4.5 x 10-3
3.2 x 104

D  45 x 10-4
3.2 x 104

A  TRUE

B  FALSE

A  move faster than lower-energy photons.

B  have more mass than lower-energy photons.

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

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

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

A  FALSE

B  TRUE

A  an eclipsing binary

B  an astrometric binary

C  a spectroscopic 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  now way to tell with available data

B  the same distance

C  farther

D  closer

A  FALSE

B  TRUE

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

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

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

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

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

A  converging spectral lines

B  2 visible stars orbiting each other

C  oscillatory (wobbly) star motions

D  varying star intensities

A  FALSE

B  TRUE

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

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

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

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

A  with extra neutrinos

B  with extra electrons

C  with extra neutrons

D  with extra protons

A  triple alpha process

B  proton-proton chain

C  carbon-nitrogen-oxygen cycle

D  nucleosynthesis

A  Triton

B  Venus

C  Uranus

D  Io

A  the Zeeman effect and the Maunder minimum

B  differential rotation, winding up the magnetic fields

C  granulation oscillations

D  a constant dipole magnetic field

E  nuclear explosions

A  TRUE

B  FALSE

A  a photon

B  an ion

C  an electron

D  a proton

E  a neutron

A  core temperature

B  distance

C  expansion/contraction

D  mass

A  TRUE

B  FALSE

A  Photon emission occurs randomly, in any direction.

B  Electrons have discrete energy levels.

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  FALSE

B  TRUE

A  megaclusters

B  Mira clusters

C  globular clusters

D  open clusters

E  elliptical galaxies

A  toward us

B  not speed, but energies due to temperature

C  across the field of view

D  away from us

A  TRUE

B  FALSE

A  Normal hydrogen is also called protium.

B  Hydrogen normally has one proton.

C  Hydrogen normally has one electron.

D  Hydrogen normally has one neutron.

A  FALSE

B  TRUE

A  Venus

B  Uranus

C  Mars

D  Earth

A  FALSE

B  TRUE

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

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

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

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

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

A  Sirius is located 10 ps from Earth.

B  Sirius is located greater then 10 ps from Earth.

C  Sirius is located less than 10 ps from Earth.

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

A  TRUE

B  FALSE

A  4

B  1/4

C  16

D  1/16

A  7

B  18

C  8

D  10

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

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

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

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

A  protons

B  valence shields

C  Bohr model

D  electrons

E  neutrons

A  photosphere temperature

B  fusion density

C  emitted intensity

D  speed of light

E  core temperature

A  TRUE

B  FALSE

A  Cepheids

B  binary stars

C  brown giants

D  long period variables

A  blue

B  red

C  green

D  white

A  > 10 billion years

B  5 billion years

C  young (< millions of years)

A  TRUE

B  FALSE

A  FALSE

B  TRUE

A  sunspots and heliosiesmology are associated with the photosphere

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

C  the corona is the solar wind

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

A  mass

B  pressure

C  temperature

D  gravity

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

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

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

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

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

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

B  It has one neutron and one proton.

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

D  It is an isotope of hydrogen.