A wave equation is given by $\;x_{1}=A \sin w(t-\large\frac{x}{K})\;$ where A is in mts , w is in Hz , x is in mts . The units of k are

Question

$(a)\;m/s\qquad(b)\;m/s^2\qquad(c)\;m\qquad(d)\;m^2/s^2$