The transverse sinusoidal wave of amplitude $a$, wavelength $\lambda$ and frequency $f$ is travelling on a stretched string. The maximum speed of any point on the string is $v/10$, where $v$ is the speed of propagation of the wave. If $a={10}^{-3} m$ and $v=10 m{s}^{-1}$, then $\lambda$ and $f$ are given by