An Assessment: Think Pair Share

1
An Assessment Think Pair Share

• Best procedures read quietly to yourself (so
  you dont give any subconscious clues)
• As the instructor, we read it too, for timing,
  then ask if anyone needs more time
• If not, its time to vote simultaneouslyuse your
  fingers, right in front of your chest so others
  dont see (anonymous)

2
An observer far outside our galaxy would best
describe our galaxy and the Sun's position in it
as a

1. disk of stars with our Solar System located
   halfway to the edge.
2. disk of stars centered on our Solar System.
3. disk of stars with a bulge that contains our
   Solar System.
4. sphere of stars centered on our Solar System.
5. sphere of stars with our Solar System located
   near the edge.

3
What causes light from a star to be
Doppler-shifted?

• 1. the distance between us and the star
• 2. the gas and dust between us and the star
• 3. the speed of the star toward or away from
  us
• 4. temperature differences between us and the
  star

4
How does the size of a star near the top left of
the H-R diagram compare with a star of the same
luminosity near the top right of the H-R diagram?

1. They are the same size.
2. The star near the top left is larger.
3. The star near the top right is larger.
4. There is insufficient information to determine
   this.

5
When a star becomes a red giant it becomes much
brighter because it is

• 1. moving closer to us.
• 2. losing its outer envelope.
• 3. fusing iron in its core.
• 4. increasing in size.

6
Which pieces of evidence support the Big Bang
theory?

1. Radioactive dating of meteorites shows an age of
   5.5 billion years.
2. The cosmic background radiation is visible in all
   directions at a temperature of 3 degrees absolute
   zero.
3. Almost every galaxy has a red-shift, with more
   distant galaxies having the highest red-shift.
4. The closest galaxies are all blue-shifted,
   showing that our universe is slowing down.

1. Just A and D
2. A, B, and C
3. Just B and C
4. A, B, and D