Introduction to Astrophysics I, 29:119
Fall, 2006
Third Homework Set...September 21, 2006.
Due September 28, 2006

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.

(1) Emission lines at a radio frequency of 325 MHz (radio recombination lines) are produced by the 272 $\alpha$ transition of a hydrogen atom, that is, a transition from the $n=273 \rightarrow 272$ state. What is the size of such an atom, in the sense of the Bohr model of the atom?

(2) Problem 3.10 from textbook.

(3) Problem 5.5

(4) Problem 5.15