Exam 3

A  4.5 x 103
32 x 103

B  45 x 10-4
3.2 x 104

C  4.5 x 10-3
3.2 x 104

D  4.5 x 10-4
32 x 103

A  TRUE

B  FALSE

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

B  move faster than lower-energy photons.

C  have more mass than lower-energy photons.

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

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

A  FALSE

B  TRUE

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

B  a visual binary

C  an eclipsing binary

D  a spectroscopic binary

E  an astrometric binary

A  FALSE

B  TRUE

A  TRUE

B  FALSE

A  the same distance

B  now way to tell with available data

C  closer

D  farther

A  FALSE

B  TRUE

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

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

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

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  converging spectral lines

B  2 visible stars orbiting each other

C  oscillatory (wobbly) star motions

D  varying star intensities

A  TRUE

B  FALSE

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

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

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

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

A  with extra electrons

B  with extra neutrinos

C  with extra protons

D  with extra neutrons

A  nucleosynthesis

B  triple alpha process

C  proton-proton chain

D  carbon-nitrogen-oxygen cycle

A  Io

B  Venus

C  Triton

D  Uranus

A  nuclear explosions

B  differential rotation, winding up the magnetic fields

C  the Zeeman effect and the Maunder minimum

D  a constant dipole magnetic field

E  granulation oscillations

A  FALSE

B  TRUE

A  a proton

B  an electron

C  a photon

D  an ion

E  a neutron

A  core temperature

B  mass

C  expansion/contraction

D  distance

A  FALSE

B  TRUE

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

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

C  Electrons have discrete energy levels.

D  Photon emission occurs randomly, in any direction.

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

A  FALSE

B  TRUE

A  open clusters

B  megaclusters

C  Mira clusters

D  globular clusters

E  elliptical galaxies

A  away from us

B  across the field of view

C  not speed, but energies due to temperature

D  toward us

A  FALSE

B  TRUE

A  Hydrogen normally has one electron.

B  Normal hydrogen is also called protium.

C  Hydrogen normally has one proton.

D  Hydrogen normally has one neutron.

A  FALSE

B  TRUE

A  Mars

B  Earth

C  Uranus

D  Venus

A  TRUE

B  FALSE

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

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

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

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

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

A  Sirius is located greater then 10 ps from Earth.

B  Sirius is located less than 10 ps from Earth.

C  Sirius is located 10 ps from Earth.

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

A  FALSE

B  TRUE

A  1/16

B  1/4

C  4

D  16

A  10

B  8

C  7

D  18

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

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

A  electrons

B  protons

C  neutrons

D  valence shields

E  Bohr model

A  fusion density

B  core temperature

C  emitted intensity

D  photosphere temperature

E  speed of light

A  FALSE

B  TRUE

A  Cepheids

B  brown giants

C  long period variables

D  binary stars

A  green

B  white

C  blue

D  red

A  5 billion years

B  young (< millions of years)

C  > 10 billion years

A  TRUE

B  FALSE

A  TRUE

B  FALSE

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

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

C  sunspots and heliosiesmology are associated with the photosphere

D  the corona is the solar wind

A  pressure

B  mass

C  gravity

D  temperature

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

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

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

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

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

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.