2 \Part{a} Calculate the speed of a proton that is accelerated from
3 rest through a potential difference of $\Delta V = 120\U{V}$.
4 \Part{b} Calculate the speed of an electron that is accelerated
5 through the same potential difference.
6 \end{problem*} % problem 20.1
12 E_0 = \frac{1}{2}m_p v^2 = E_1 = e\Delta V \\
13 v = \sqrt{\frac{2 e \Delta V}{m_p}}
14 = \sqrt{\frac{2 \cdot 1.60\E{-19}\U{C} \cdot 120\U{V}}{1.67\E{-27}\U{kg}}}
18 \Part{b} Replacing $m_p$ with $m_e$
20 v = \sqrt{\frac{2 e \Delta V}{m_e}}
21 = \sqrt{\frac{2 \cdot 1.60\E{-19}\U{C} \cdot 120\U{V}}{9.11\E{-31}\U{kg}}}