Exam 3

A  4.5 x 103
32 x 103

B  4.5 x 10-4
32 x 103

C  45 x 10-4
3.2 x 104

D  4.5 x 10-3
3.2 x 104

A  TRUE

B  FALSE

A  move faster than lower-energy photons.

B  have more mass than lower-energy photons.

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

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

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

A  TRUE

B  FALSE

A  a spectroscopic binary

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

C  an eclipsing binary

D  an astrometric binary

E  a visual binary

A  FALSE

B  TRUE

A  FALSE

B  TRUE

A  now way to tell with available data

B  the same distance

C  closer

D  farther

A  FALSE

B  TRUE

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

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

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

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

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

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  An explosion throws out mass that settles as a star.

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

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

A  with extra electrons

B  with extra neutrons

C  with extra neutrinos

D  with extra protons

A  carbon-nitrogen-oxygen cycle

B  nucleosynthesis

C  triple alpha process

D  proton-proton chain

A  Uranus

B  Io

C  Venus

D  Triton

A  granulation oscillations

B  differential rotation, winding up the magnetic fields

C  the Zeeman effect and the Maunder minimum

D  a constant dipole magnetic field

E  nuclear explosions

A  TRUE

B  FALSE

A  a neutron

B  an ion

C  an electron

D  a proton

E  a photon

A  core temperature

B  expansion/contraction

C  mass

D  distance

A  TRUE

B  FALSE

A  Electrons have discrete energy levels.

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

C  Photon emission occurs randomly, in any direction.

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

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

A  FALSE

B  TRUE

A  globular clusters

B  Mira clusters

C  open clusters

D  megaclusters

E  elliptical galaxies

A  not speed, but energies due to temperature

B  away from us

C  across the field of view

D  toward us

A  FALSE

B  TRUE

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  Mars

B  Uranus

C  Earth

D  Venus

A  FALSE

B  TRUE

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

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  tidal forces prevent the material in rings from forming into moons

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

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

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

B  Sirius is located greater then 10 ps from Earth.

C  Sirius is located 10 ps from Earth.

D  Sirius is located less than 10 ps from Earth.

A  FALSE

B  TRUE

A  4

B  16

C  1/4

D  1/16

A  10

B  8

C  18

D  7

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

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

A  electrons

B  Bohr model

C  protons

D  neutrons

E  valence shields

A  photosphere temperature

B  speed of light

C  emitted intensity

D  core temperature

E  fusion density

A  FALSE

B  TRUE

A  binary stars

B  long period variables

C  Cepheids

D  brown giants

A  white

B  green

C  red

D  blue

A  young (< millions of years)

B  > 10 billion years

C  5 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  the chromosphere is best viewed with a H-alpha filter

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

A  gravity

B  mass

C  pressure

D  temperature

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

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

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

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

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

A  It is an isotope of hydrogen.

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

C  It has one neutron and one proton.

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