Answer
See explanation.
Work Step by Step
a. $p=\frac{h}{\lambda}=\frac{6.626\times10^{-34}J \cdot s}{2.80\times10^{-10}m}=2.37\times10^{-24}kg \cdot m/s$
b. $K=\frac{p^2}{2m}=\frac{(2.37\times10^{-24}kg \cdot m/s)^2}{2(9.11\times10^{-31}kg)}=3.08\times10^{-18}J=19.3 eV$
