deletions | additions       diff --git a/Problem 1.tex b/Problem 1.tex  index 6fea5a3..6dd3b5e 100644  --- a/Problem 1.tex  +++ b/Problem 1.tex 
...
b=\frac{2e^2}{m_e v^2}\sim1\times10^{-7}~\rm{cm}  \end{align}  \noindent which corresponds to a mean free path of $l=3\times10^{-13}~\rm{cm}$. The timescale is then $\boxed{\tau=l/v\sim4\times10^5~\rm{s}\sim5~\rm{days}\sim0.01~\rm{yrs}$.  \subsection{Part b}   \subsection{Part c}