The sun & solar physics
The solar neutrino problem (neutrino deficit problem)
consists in the observation of only one third to one half
of the electron neutrinos predicted by the standard so-
lar model to be emitted by the Sun. This problem has
been solved by measurements performed in the late 1990s
and early 2000s (and leading to the 2015 Nobel Prize
in Physics). The resolution consists in that the neutri-
nos have ———————- mass and oscillate between the
three “flavors” according to —————– mechanics.
what is NONZERO; QUANTUM
The order of the seven spectral classes is
O B A F G K M.
The brightest supergiant stars belong to luminosity class
I.
The Great Nebula in Orion (M42) is
AN ACTIVE REGION OF STAR FORMA-
TION.
What direct observational evidence do we have of the
correct energy source that powers the Sun?
what is SOLAR NEUTRINOS.
An HR diagram provides a plot of the ——————- of
stars.
(a) distance vs luminosity
(b) luminosity vs temperature
(c) temperature vs spectral class
(d) luminosity vs spectral class
what is
(b) luminosity vs temperature
(c) temperature vs spectral class
The most dense spatial grouping of stars is found in
GLOBULAR CLUSTERS.
A planetary nebula is
THE VASTLY EXPANDED SHELL OF A
DYING STAR.
The sunlight we enjoy on Earth started its journey from
the Sun’s core
what is
A FEW HUNDRED THOUSAND TO ONE
MILLION YEARS AGO.
The most massive main sequence stars belong to spectral
classes
O AND B.
A relatively loosely held grouping of stars is
AN OPEN CLUSTER.
In the densest interstellar cloud, the particle density is —
———————— the particle density of air at sea level
on Earth.
MUCH SMALLER THAN
Which of the following layers of the Sun is the coolest?
THE PHOTOSPHERE.
The dominating factor that distinguishes the luminosity
classes is that of
SIZE.
In order to find the masses of the stars in a binary system,
the orbital period and the —————————- of the
stars must be known.
SIZE OF THE ORBITS
The reddening of starlight as it passes through interstellar
dust clouds is due to
SCATTERING.
who are the brightest stars
What is AVAA N KHELSI!!
The winding and twisting of the Sun’s magnetic field from
the Sun’s rotation causes
(a) The sunspot cycle.
(b) Solar flares.
(c) Coronal mass ejections.
According to the main-sequence mass-luminosity rela-
tionship, a star a hundred times as massive as the Sun
will be ——————————- luminous than the Sun.
APPROXIMATELY 10×(100)3 = TEN MIL-
LION TIMES MORE
Consider a binary star system consisting of a 30MSun
black hole and a 70MSun red supergiant. They orbit
about their common center of mass in 1/10 of a year (i.e.,
say, 36.5 days) in approximately circular orbits. What is
their separation distance a in AUs?
1 AU
A nebula that glows due to fluorescence is called
AN EMISSION NEBULA.
Whos about to pass
KHHELSI N AVAA!!