Astro 1500 Final Exam Review 2: Lectures 15-26

Where and when is the final going to start?

• Physics 3, Monday, December 16, 12 PM

• Physics 3, Monday, December 16, 12 PM

• Physics 3, Monday, December 16, 12 PM

• Physics 3, Monday, December 16, 12 PM

• Santa Claus's workshop, Sunday, February 31, Midnight

Which element will not produce net energy in stellar fusion?

• Hydrogen

• Oxygen

• Sodium

• Iron

Tags

NGSS.HS-ESS1-1

NGSS.HS-ESS1-3

Why are white dwarfs so hot?

• White dwarfs fuse more hydrogen since they are more dense

• White dwarfs fuse heavier elements since they are more dense

• White dwarfs magnetic field amplifies the heat produced

• Because they used to be a star's core

Tags

NGSS.HS-ESS1-3

True or False: White Dwarfs and Neutron Stars produce energy through elemental fusion?

• True

• False

Tags

NGSS.HS-ESS1-3

Follow up question: Regular Stars counteract gravitational collapse through force of elemental fusion. How do white dwarfs prevent gravitational collapse?

• Neutron Degeneracy Pressure

• Electron Degeneracy Pressure

• Strong Nuclear Force

• Magnetic Force

Which spectral type main-sequence star would live the longest?

• O-Stars

• B-Stars

• K-Stars

• M-Stars

True or False: Out of true stars, O-type stars have the weakest hydrogen lines

• True

• False

Tags

NGSS.HS-ESS1-3

Which of the following about main-sequence stars is FALSE?

• Main-sequence stars always fuse hydrogen

• When a main-sequence star runs out of hydrogen, the core contracts and moves off the main-sequence

• For main-sequence stars, bluer stars typically have the longest lifespan

• For main-sequence stars, the hotter the temperature the more massive the star is

Tags

NGSS.HS-ESS1-1

NGSS.HS-ESS1-3

Why do younger stars typically live in the spiral arms of galaxies?

• The rotation of the spiral arms produces newer stars

• Galaxies acquire mass and grow in size, so younger stars form towards the outside

• Younger stars are produced in the center but pushed out to the spiral arms

• Younger stars need a lot of room in space to form

Tags

NGSS.HS-ESS1-3

HI Clouds can be detected from...

• 21 cm radio line produced by spin-flip transitions

• Electron Degeneracy Pressue

• Space Telescopes

• Interference of gamma rays

Tags

NGSS.HS-PS4-3