$\begin{aligned} & \lambda=\frac{\mathrm{h}}{\mathrm{mv}}=\frac{\mathrm{h}}{\sqrt{2 \mathrm{mK}}}=\frac{\mathrm{h}}{\sqrt{2 \mathrm{mqV}}} \\ & \frac{\lambda_1}{\lambda_2}=\sqrt{\frac{\mathrm{m}_2}{\mathrm{~m}_1}} \\ & \frac{\lambda_{\mathrm{e}}}{\lambda_{\mathrm{p}}}=\sqrt{\frac{\mathrm{m}_{\mathrm{p}}}{\mathrm{m}_{\mathrm{e}}}}=\sqrt{1831.4}=42.79\end{aligned}$