The wave length of light from the spectral emission line of sodium is $589\;nm$ . Find the kinetic energy at which a neutrals would have the same de - Broglie wavelength . given $(h= 6.6 \times 10^{-34}\;Js, mn=1.66 \times 10^{-27}\;kg)$

Question

$\begin{array}{1 1} 3.81 \times 10^{-27}\;J \\ 3.81 \times 10^{-27}\;KJ \\ 3.81 \times 10^{-28}\;J \\ 3.81 \times 10^{-28}\;KJ \end{array} $