Exam 3

A  45 x 10-4
3.2 x 104

B  4.5 x 10-3
3.2 x 104

C  4.5 x 103
32 x 103

D  4.5 x 10-4
32 x 103

A  FALSE

B  TRUE

A  travel less distance between their source and the observer 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  move faster than lower-energy photons.

E  have more mass than lower-energy photons.

A  FALSE

B  TRUE

A  a spectroscopic binary

B  an astrometric binary

C  an eclipsing binary

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

E  a visual binary

A  TRUE

B  FALSE

A  TRUE

B  FALSE

A  closer

B  farther

C  now way to tell with available data

D  the same distance

A  TRUE

B  FALSE

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

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

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

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

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

A  varying star intensities

B  2 visible stars orbiting each other

C  oscillatory (wobbly) star motions

D  converging spectral lines

A  TRUE

B  FALSE

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

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

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

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

A  with extra neutrons

B  with extra neutrinos

C  with extra electrons

D  with extra protons

A  triple alpha process

B  carbon-nitrogen-oxygen cycle

C  nucleosynthesis

D  proton-proton chain

A  Uranus

B  Venus

C  Io

D  Triton

A  the Zeeman effect and the Maunder minimum

B  granulation oscillations

C  differential rotation, winding up the magnetic fields

D  a constant dipole magnetic field

E  nuclear explosions

A  TRUE

B  FALSE

A  an ion

B  a neutron

C  a proton

D  a photon

E  an electron

A  mass

B  distance

C  expansion/contraction

D  core temperature

A  FALSE

B  TRUE

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

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

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

D  Electrons have discrete energy levels.

E  Photon emission occurs randomly, in any direction.

A  TRUE

B  FALSE

A  Mira clusters

B  globular clusters

C  elliptical galaxies

D  megaclusters

E  open clusters

A  away from us

B  toward us

C  not speed, but energies due to temperature

D  across the field of view

A  TRUE

B  FALSE

A  Normal hydrogen is also called protium.

B  Hydrogen normally has one electron.

C  Hydrogen normally has one neutron.

D  Hydrogen normally has one proton.

A  FALSE

B  TRUE

A  Venus

B  Uranus

C  Earth

D  Mars

A  FALSE

B  TRUE

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

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

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

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

C  Sirius is located less than 10 ps from Earth.

D  Sirius is located 10 ps from Earth.

A  TRUE

B  FALSE

A  1/16

B  1/4

C  4

D  16

A  18

B  8

C  7

D  10

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

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

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

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  neutrons

C  electrons

D  protons

E  valence shields

A  speed of light

B  core temperature

C  fusion density

D  emitted intensity

E  photosphere temperature

A  TRUE

B  FALSE

A  binary stars

B  brown giants

C  long period variables

D  Cepheids

A  blue

B  white

C  red

D  green

A  5 billion years

B  young (< millions of years)

C  > 10 billion years

A  FALSE

B  TRUE

A  FALSE

B  TRUE

A  the corona is the solar wind

B  sunspots and heliosiesmology are associated with the photosphere

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  reflecting; the smearing of light due to atmospheric turbulence.

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

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 is an isotope of hydrogen.

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