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{\bf Introduction to Astrophysics II, 29:120\\
     Spring, 2009\\
Fourth Homework Set...February 13, 2009. Due February 19, 2009}\\
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This is a shorter assignment than usual this week, to allow you to get ready for the exam. 
The question I {\em really} want to ask you will come next week. \\




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{\bf (1)} Are the electrons in a bar of copper at room temperature degenerate?  
Show the calculations that allow you to reach your conclusion. \\

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{\bf (2)} Problem 16.1 from the textbook. \\

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{\bf (3)} Problem 16.5 from the textbook.    \\ 


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{\bf (4)} Generalize the derivation of the Fermi Energy presented in class to the case of a 2 dimensional star, i.e. particles are confined to a box of size $L$ in both the $x$ and $y$ directions.  Compare your result to the equation derived in class for 1D, and the correct value for the Fermi Energy given in eq. 15.2 of the book.  
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{\bf (5)} Problem 16.6 from the textbook. 
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