DO ALL 14 PROBLEMS. MARK YOUR ANSWERS ON THIS SHEET AND TURN IT IN. SHOW WORK ON THE LAST 4 PROBLEMS.
Multiple Choice are worth 4 points each.

c=3x10¹⁰ G=6.7x10^-8 h=6.6x10^-27 s =5.7x10^-5
1pc=3x10¹⁸cm 1AU=1.5x10¹³cm M_¤ =2x10³³g R_¤ =7x10¹⁰cm
   F=ma  x=vt v=at
    

____1. Which of the following can a Black Hole actually have?
a. magnetic field b. star spots c. rotation period d. thermal spectrum e. x-ray pulse

_____ 2. The maximum mass for a white dwarf is:
a. 0.7M_¤ b. 1.44M_¤ c. 2.1M_¤ d. 256M_¤ e. no limit

_____ 3. Which Nuclear Process creates carbon?:
a. CNO cycle b. U238 fission c. proton-proton chain d. beta decay e. triple alpha

_____ 4. The most recent supernova visible to the naked eye was in:
a. 1987 b. 1886 c. 1604 d. 1578 e. 1054

_____ 5. A planetary nebula appears red because of:
a. its low temperature
b. the ionization and recombination of hydrogen
c. the extreme Doppler shift the ejected material
d. high concentration of dust in the shell
e. differential scattering of ultraviolet radiation

_____ 6. A Type I supernova.
a. involves a binary star
b. involves a white dwarf
c. leaves no collapsed stellar remnant
d. can happen anywhere in the MIlky Way
e.all of these
 
_____ 7. What is a main sequence dwarf burning in its core?
a. hydrogen b. helium c. carbon d. oxygen e. all of these

_____ 8. As a white dwarf star cools, what happens to its radius?
a. it decreases b. it stays the same c. it grows

_____ 9. As a neutron star grows in mass, what happens to its radius?
a. it decreases b. it stays the same c. it grows

_____ 10.The energy that powers a pulsar comes from:
a. rotation b. gravitational settling c. magnetic fields d. neutrinos e. supernova remnants

11. (10 points) Explain the processes that lead to a Type II supernova, and what happens during the explosion. Use diagrams as needed. The more detail, the more points.

12. (15 points) Explain why the position of a star on the Main Sequence is a function of mass only.

14. (20 points) Draw and H-R diagram. Label both axes. Draw the main sequence and show the position of the Sun. Show the path a two solar mass star follows from proto-star to final resting point. Label what the star is called in each of the major stages.

Multiple Choice Answers

1)D 2)B 3)E 4)A 5)B 6)E 7)A 8)B 9)A 10)A