A transverse wave on a string

$10$ points

is described by the equation:

$y(x,t)=0\mathrm{.}05sin(8t-x+),$

where $x$ and $y$ are in meters and $t$ is in seconds. The frequency, $f,$ and the wavelength, $,$ are:

$f=0\mathrm{.}5Hz$ and $=0\mathrm{.}25m$

$f=4Hz$ and $=2m$

$f=2Hz$ and $=4m$

$f=0\mathrm{.}25Hz$ and $=0\mathrm{.}5m$