A traveling wave on a string is described by the following equation:

D$($x$,$t$)=0\mathrm{.}09$sin$(7\mathrm{.}4$x$162$t$)$

where D is the transverse deflection $($in y$-$ or z$-$ direction$).$ All numbers are in MKS unit.

What is the wavelength in m$?$