Assume that the displacement (s) of air is proportional to the pressure difference $(\Delta \mathrm{p})$ created by a sound wave. Displacement (s) further depends on the speed of sound (v), density of air ( $\rho$ ) and the frequency (f). If $\Delta p \sim 10 \mathrm{~Pa}, v \sim 300 \mathrm{~m} / \mathrm{s}$, $\rho \sim 1 \mathrm{~kg} / \mathrm{m}^3$ and $\mathrm{f} \sim 1000 \mathrm{~Hz}$, then s will be of the order of (take the multiplicative constant to be 1 )