The typical de Broglie wavelength associated with a $He$ atom in $He$ gas at room temperature $(27^{\circ}C)$ and $1 \: atm$ pressure is $ \lambda$, and the mean separation between two atoms under these conditions is $r.$

Question

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