Astro 1500 October 16, 2024 Trivia - Exam 2 Review (Lects. 8-11)

What is the correct order of the layers of the Sun (innermost first?)

• Core, convective zone, photosphere, radiative zone, photosphere

• Core, convective zone, radiative zone, photosphere

• Core, radiative zone, convective zone, photosphere

• Core, photosphere, radiative zone, convective zone

Tags

NGSS.HS-ESS1-1

Why are sunspots cooler than the rest of the Sun's surface?

• Magnetic fields inhibit convection

• The natural flow of the photosphere sometimes makes cooler spots

• Especially large bubbles in the convective zone are cooler

• Sunspots aren't cooler, just darker

Gravity is constantly trying to compress the Sun, but it doesn't collapse. Why?

• The Sun's heat naturally makes it expand

• The atoms in the Sun refuse to compress any further

• Core fusion makes an outward pressure

Tags

NGSS.HS-ESS1-1

Star A is 10 parsecs away. Star B is 7 parsecs away. Which one has the greater parallax angle?

• Star A

• Star B

• They have the same parallax angle

• Need more information

Star A has a twice the tangential velocity of Star B. Star A is twice as far away as Star B. How do their proper motions compare?

• Star A has twice the proper motion that Star B has

• Star A has four times the proper motion that Star B has

• Star B has twice the proper motion that Star A has

• Star B has four times the proper motion that Star A has

• They have the same proper motion

You observe a star with a hydrogen line at 658 nm, but the hydrogen line is supposed to be at 656 nm. What's happening?

• The star is moving toward us

• The star is moving away from us

• The star is becoming a red giant

• You're not observing a hydrogen line

Tags

NGSS.HS-PS4-1

NGSS.HS-ESS1-2

Someone reports that a star has a negative velocity. From that, you can deduce that the star's spectral lines are...

• Spectral lines have nothing to do with this problem

• Redshifted

• Blueshifted

• Red and blue shifting

Tags

NGSS.HS-PS4-1

NGSS.HS-PS4-3

NGSS.HS-ESS1-2

What CAN'T Doppler shift tell you?

• A star's radial velocity

• A star's tangential velocity

• The presence of stellar companions

• A star's rotation rate

Tags

NGSS.HS-PS4-3

Why don't the bluest stars have hydrogen lines?

• They're too cool to excite hydrogen

• They have little hydrogen

• The hydrogen lines are dominated by other materials

• They ionize the hydrogen

Tags

NGSS.HS-ESS1-3

NGSS.HS-PS1-2

Brown dwarf stars are...

• The old remnants of stars

• More massive than planets and less massive than stars

• Stars obscured by dust

• Progenitors to planets like Jupiter and Saturn