Question

A white dwarf is:______.

a. a hot but very small main-sequence star with a mass of less than 1.4 solar masses.
b. the name for the singularity at the center of a black hole.
c. a cool and very small main-sequence star with a mass of less than 1.4 solar masses.
d. the exposed core of a dead star, supported by neutron degeneracy pressure.
e. the exposed core of a dead star, supported by electron degeneracy pressure.

Answer 1

the exposed core of a dead star, supported by electron degeneracy pressure.

Step-by-step explanation:

A white dwarf is a low luminosity exposed core of a dead star having mass comparable to the sun but volume comparable to the earth . So its density is very high . These stars have lost the capacity to generate energy through the process of fusion . Due to high gravitational energy , it goes on shrinking but ultimately balanced by electron degeneracy pressure. It is not a main sequence star as it has lost the power of fusion .