The temperature of an ideal gas in 3-dimensions is 300 K. The corresponding de-Broglie wavelength of the electron approximately at 300 K is:
$\begin{aligned} & {\left[\mathrm{m}_{\mathrm{e}}=\text { mass of electron }=9 \times 10^{-31} \mathrm{~kg}\right.} \\ & \mathrm{h}=\text { Planck constant }=6.6 \times 10^{-34} \mathrm{Js} \\ & \left.\mathrm{k}_{\mathrm{B}}=\text { Boltzmann constant }=1.38 \times 10^{-23} \mathrm{JK}^{-1}\right]\end{aligned}$