Consider an X-ray binary system in which a compact object, surrounded by an accretion disk, is in a binary orbit with another star. All of the following statements about such accretion disks are true except:
A) The radiation from an accretion disk may vary rapidly in time.
B) The compact object may be either a neutron star or a black hole.
C) X-rays are emitted by the hot gas in the accretion disk.
D) Several examples of flattened accretion disks being fed by a large companion star can be seen clearly in photos from the Hubble Space Telescope.
E) The accretion disk consists of material that spills off the companion star.
Question 2
The nucleus of a comet is typically
A) a few hundred kilometers across, and bright, shiny white from its ices.
B) a few meters in diameter.
C) located between the orbits of Mars and Jupiter.
D) a few kilometers in size, and very low in density.
E) very durable, made of iron.
inflammatory system
The skeletal system.
The respiratory system.
The limbic system is located within the higher brain, or cerebrum.
The Digestive System "الجهاز الهضمي"
Urinary System: Facts, Functions & Diseases