Compute the typical de Broglie wavelength of an electron $(\lambda)$ in a metal at $ 27^{\circ}C$ and compare it with the mean separation between two electrons(r) in a metal which is given to be about $2 \times 10^{-10}m$

Question

$\begin {array} {1 1} (a)\;\lambda > r & \quad (b)\;\lambda = r \\ (c)\;\lambda < r & \quad (d)\;none\: of \: these \end {array}$