Astro 11.docx - 1. Why couldn't electrons bind to nuclei...

1.
Why couldn't electrons bind to nuclei when the nuclei first formed?
A) universe was much too cold
B) electrons exert the strong force on the nuclei and repel it
C) electrons have negative charge and repel the nuclei
D) electrons exert the weak force on the nuclei and repel it
E) universe was much too hot
Correct Answer(s): E
Points Earned: 2.0/2.0
2.
Why can't we see back the whole way to the Big Bang?
Points Earned: 2.0/2.0
3.
Most spiral galaxies have rotation curves that
Points Earned: 2.0/2.0
4.
What do quasars look like?

D) Individual stars in the Milky Way.
E) Glowing gas clouds.
Points Earned: 2.0/2.0
5.
Which of the following are flavors of quarks?
A) baryons and antibaryons
B) leptons and antileptons
C) charge and mass
D) blue and green
E) up and strange
Correct Answer(s): E
Points Earned: 2.0/2.0
6.
How many times bigger is the Local Group of Galaxies in which the Milky Way
resides than the Milky Way Galaxy itself?
Points Earned: 2.0/2.0
7.
Which of the following is TRUE?

measure a blueshift.
E) A redshift occurs when a photon loses energy and slows down as it moves through space.
Points Earned: 2.0/2.0