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{\bf Introduction to Astrophysics I, 29:119\\
     Fall, 2006\\
Fourth Homework Set...September 29, 2006.\\ Due October 5, 2006}\\
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Show calculations and give reasons for your answers. Don't go around 
confused and despondent; if you do not know how to get started, ask me for help. All problem numbers refer to the first edition of the book.\\


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{\bf (1)} Problem 3.12     \\

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{\bf (2)} Problem 5.7 \\

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{\bf (3)} Problem 5.8 \\ 

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{\bf (4)} Problem 5.10\\

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{\bf (5)} Problem 5.11\\

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{\bf (6)} Problem 5.14\\

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{\bf (7)} Problem 5.16\\

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{\bf (8)} What are the spectroscopic designations of the lowest-lying energy levels of the nitrogen atom?  Exclude those states which would violate the Pauli Exclusion Principle.  Comment on those states which you have so excluded. \\


 
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