**Prob. Set 1: Assigned Tuesday, Sept. 17, Due Thursday, Sept. 26 (this problem set is now complete):**

**Do Prob. 1.3b (skip part a). Add a part c) to this question which states: Suppose that the Sun had the density distribution that is given in part b). Find the radius which contains 90% of the Sun's mass. (The central density of the Sun is 150.5 g/cm^3.) Compare your result to the actual value given by the SSM (standard solar model). Is the density distribution of the Sun steeper or flatter than this model? Explain.**

Do Prob. 2.5. Note that height, h, refers to the height

Do Prob. 2.6. Note that the negative hydrogen ion

Do Prob. 2.7. You'll need to solve several equations in several unknown so I recommend using computer algebra to help.

3.05 a) Plot graphs of the following quantities from the standard solar model (SSM) as a function of

radius (R/Rsun); density (rho); pressure (P); temperature (T), luminosity (L/Lsun); abundance of hydrogen (X); abundance of He4 (Y)

b) Compare your results to the plots handed out in class where these quantities (except the first) were plotted against R/Rsun.

Do Prob. 2.5. Note that height, h, refers to the height

*above*the radius of the Sun in km.Do Prob. 2.6. Note that the negative hydrogen ion

*cannot*be ignored when it comes to opacity but it*can*be ignored when one considers number densities as is the case for this problem.Do Prob. 2.7. You'll need to solve several equations in several unknown so I recommend using computer algebra to help.

3.05 a) Plot graphs of the following quantities from the standard solar model (SSM) as a function of

*mass*(M/Msun) rather than radius:radius (R/Rsun); density (rho); pressure (P); temperature (T), luminosity (L/Lsun); abundance of hydrogen (X); abundance of He4 (Y)

b) Compare your results to the plots handed out in class where these quantities (except the first) were plotted against R/Rsun.

**Prob. Set 2: Assigned Thursday, Sept. 26, Due Thursday, Oct. 3:**

**Prob. Set 3: Assigned Thursday, Oct. 3, Due Monday, Oct. 14:**

**Prob. Set 4: Assigned Tuesday, Oct. 15, Due Thursday, Oct. 31:**

**Prob. Set 5: Assigned Thursday, Oct. 31, Due Thursday, Nov. 7:**

**Prob. Set 6: Assigned Thursday, Nov. 7, Due Monday, Nov. 18:**