Author Question: In some cases, a supernova in a binary system may lead to the eventual formation of an accretion ... (Read 47 times)

809779 · **on:** Jul 27, 2018

In some cases, a supernova in a binary system may lead to the eventual formation of an accretion disk around the remains of the star that exploded. All of the following statements about such accretion disks are true except

A) X-rays are emitted by the hot gas in the accretion disk.
B) the accretion disk consists of material that spills off the companion star.
C) the central object about which the accretion disk swirls may be either a neutron star or a black hole.
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 radiation from an accretion disk may vary rapidly in time.

Question 2

Describe the three sources of internal heat of the terrestrial planets?

What will be an ideal response?

mariahkathleeen · **Reply #1 on:** Jul 27, 2018

Answer to Question 1

D

Answer to Question 2

Accretion is heat generated by the agglomeration of planetesimals when the planet was formed. Differentiation is heat generated by the energy released as dense objects fall toward the center of a planet during the formation of the core of a planet. Radioactive decay generates heat by releasing nuclear energy when an unstable (radioactive) isotope decays into a more stable element.