Astronomy Unit 8 Practice Exam Questions & Answers.
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Course
Astronomy
Institution
Astronomy
Astronomy Unit 8 Practice Exam Questions & Answers.
Ranking Task: The Size of Planets, Stars, and Stellar Remnants
Part A: Listed following are several astronomical objects. Rank these objects based on their diameter, from largest to smallest. (Note that the neutron star and black hole in thi...
Astronomy Unit 8 Practice Exam
Questions & Answers.
Ranking Task: The Size of Planets, Stars, and Stellar Remnants
Part A: Listed following are several astronomical objects. Rank these objects based on their diameter,
from largest to smallest. (Note that the neutron star and black hole in this example have the same mass
to make your comparison easier, but we generally expect black holes to have greater masses than
neutron stars.) - CORRECT ANSWER -main-sequence star of a spectral type A
-Jupiter
-a one-solar-mass white dwarf
-the Moon
-a two-solar-mass neutron star
-the event horizon of a two-solar-mass black hole
Ranking Task: The Size of Planets, Stars, and Stellar Remnants
Part B: Listed following are several astronomical objects. Rank these objects based on their mass, from
largest to smallest. (Be sure to notice that the main-sequence star here has a different spectral type
from the one in Part A.) - CORRECT ANSWER -a typical black hole (formed in a supernova)
-a typical neutron star
-a one-solar-mass white dwarf
-main-sequence of spectral type M
-Jupiter
-the Moon
Ranking Task: The Size of Planets, Stars, and Stellar Remnants
Part C: Listed following are several astronomical objects. Rank these objects based on their density, from
highest to lowest. - CORRECT ANSWER -the singularity of a black hole
, -a typical neutron star
-a one-solar-mass white dwarf
-a main-sequence star
Sorting Task: The Bizarre Stellar Graveyard
Listed following are distinguishing characteristics of different end states of stars. Match these to the
appropriate consequence of stellar death. - CORRECT ANSWER White dwarf:
-in a binary system, it can explode as a supernova
-has a mass no greater than 1.4 MSun
-supported by electron degeneracy pressure
-typically about the size (diameter) of Earth
Neutron star:
-sometimes appears as a pulsar
-usually has a very strong magnetic field
Black hole:
-viewed from afar, time stops at its event horizon
-size defined by its Schwarzchild radius
Ranking Task: Length Contraction
Part A: Each figure below shows a spaceship moving past your spaceship ("YOU") at the indicated speed.
Assume that all the spaceships have equal length when at rest and that you watch the other spaceship
as its clock ticks off one second. Rank the figures based on the length that you would measure for the
other spaceship (in its direction of motion), from shortest to longest. - CORRECT ANSWER -Speed = 0.85c
-Speed = 0.8c
-Speed = 0.75c
-Speed = 0.7c
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