Exam 3

A  4.5 x 103
32 x 103

B  4.5 x 10-4
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  have higher frequencies and shorter wavelengths than lower-energy photons.

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

C  move faster than lower-energy photons.

D  have more mass than lower-energy photons.

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

A  FALSE

B  TRUE

A  an astrometric binary

B  a visual binary

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

D  an eclipsing binary

E  a spectroscopic binary

A  FALSE

B  TRUE

A  FALSE

B  TRUE

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

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

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

A  oscillatory (wobbly) star motions

B  2 visible stars orbiting each other

C  varying star intensities

D  converging spectral lines

A  TRUE

B  FALSE

A  A large gas ball spins out of a larger star when disrupted by a passing 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  An explosion throws out mass that settles as a star.

A  with extra neutrons

B  with extra protons

C  with extra electrons

D  with extra neutrinos

A  proton-proton chain

B  triple alpha process

C  nucleosynthesis

D  carbon-nitrogen-oxygen cycle

A  Uranus

B  Venus

C  Io

D  Triton

A  nuclear explosions

B  differential rotation, winding up the magnetic fields

C  a constant dipole magnetic field

D  the Zeeman effect and the Maunder minimum

E  granulation oscillations

A  TRUE

B  FALSE

A  a proton

B  a neutron

C  a photon

D  an ion

E  an electron

A  distance

B  core temperature

C  expansion/contraction

D  mass

A  FALSE

B  TRUE

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

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

C  Photon emission occurs randomly, in any direction.

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

E  Electrons have discrete energy levels.

A  FALSE

B  TRUE

A  megaclusters

B  open clusters

C  globular clusters

D  elliptical galaxies

E  Mira clusters

A  away from us

B  across the field of view

C  toward us

D  not speed, but energies due to temperature

A  FALSE

B  TRUE

A  Hydrogen normally has one neutron.

B  Hydrogen normally has one proton.

C  Normal hydrogen is also called protium.

D  Hydrogen normally has one electron.

A  FALSE

B  TRUE

A  Venus

B  Mars

C  Earth

D  Uranus

A  TRUE

B  FALSE

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

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  FALSE

B  TRUE

A  1/4

B  16

C  1/16

D  4

A  7

B  8

C  18

D  10

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

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

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

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

A  neutrons

B  valence shields

C  electrons

D  Bohr model

E  protons

A  speed of light

B  emitted intensity

C  fusion density

D  core temperature

E  photosphere temperature

A  TRUE

B  FALSE

A  brown giants

B  Cepheids

C  binary stars

D  long period variables

A  white

B  red

C  blue

D  green

A  young (< millions of years)

B  5 billion years

C  > 10 billion 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  temperature

D  pressure

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

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

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

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

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

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

B  It is an isotope of hydrogen.

C  It has one neutron and one proton.

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