Exam 3

A  4.5 x 10-3
3.2 x 104

B  4.5 x 10-4
32 x 103

C  4.5 x 103
32 x 103

D  45 x 10-4
3.2 x 104

A  TRUE

B  FALSE

A  have more mass than lower-energy photons.

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

C  move faster than 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  an eclipsing binary

B  a visual binary

C  an astrometric binary

D  a spectroscopic binary

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

A  FALSE

B  TRUE

A  FALSE

B  TRUE

A  the same distance

B  now way to tell with available data

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

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

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

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

A  converging spectral lines

B  varying star intensities

C  oscillatory (wobbly) star motions

D  2 visible stars orbiting each other

A  TRUE

B  FALSE

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

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

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

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

A  with extra neutrons

B  with extra neutrinos

C  with extra protons

D  with extra electrons

A  proton-proton chain

B  carbon-nitrogen-oxygen cycle

C  triple alpha process

D  nucleosynthesis

A  Uranus

B  Io

C  Venus

D  Triton

A  the Zeeman effect and the Maunder minimum

B  granulation oscillations

C  nuclear explosions

D  a constant dipole magnetic field

E  differential rotation, winding up the magnetic fields

A  TRUE

B  FALSE

A  a neutron

B  an electron

C  a photon

D  a proton

E  an ion

A  core temperature

B  distance

C  expansion/contraction

D  mass

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

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

A  TRUE

B  FALSE

A  Mira clusters

B  open clusters

C  globular clusters

D  elliptical galaxies

E  megaclusters

A  across the field of view

B  away from us

C  not speed, but energies due to temperature

D  toward us

A  TRUE

B  FALSE

A  Hydrogen normally has one neutron.

B  Hydrogen normally has one electron.

C  Normal hydrogen is also called protium.

D  Hydrogen normally has one proton.

A  TRUE

B  FALSE

A  Earth

B  Uranus

C  Venus

D  Mars

A  TRUE

B  FALSE

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

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

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

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  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  TRUE

B  FALSE

A  1/4

B  4

C  1/16

D  16

A  10

B  7

C  18

D  8

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

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

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

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

A  Bohr model

B  valence shields

C  protons

D  neutrons

E  electrons

A  emitted intensity

B  photosphere temperature

C  core temperature

D  fusion density

E  speed of light

A  TRUE

B  FALSE

A  brown giants

B  binary stars

C  Cepheids

D  long period variables

A  white

B  red

C  green

D  blue

A  > 10 billion years

B  5 billion years

C  young (< millions of years)

A  TRUE

B  FALSE

A  TRUE

B  FALSE

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

B  the corona is the solar wind

C  sunspots and heliosiesmology are associated with the photosphere

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

A  gravity

B  mass

C  pressure

D  temperature

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

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

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

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

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 more proton than an average hydrogen atom.

C  It has one neutron and one proton.

D  It is an isotope of hydrogen.