Q 12-11-030NEETJEE MainEasy
An electron and a proton have the same de Broglie wavelength. Which has the greater kinetic energy?
Answer: (B) the electron
Same $\lambda$ means the same momentum $p$. $K = \dfrac{p^2}{2m}$ is larger for the smaller mass: the electron.
Solution by Sreeraj P, M.Sc Physics