A wave equation is y = 10^-4 sin (60t+2x), where x and y are in metre and t is in sec. which of the following statement is true 

$$\begin{gathered} \mathrm{y}={10}^{-4}\sin (60\mathrm{t}+2\mathrm{x}) \\ \mathrm{we} \mathrm{know} \mathrm{that} \mathrm{y}=\mathrm{asin}\mathrm{\omega }\left(\mathrm{t}+\frac{\mathrm{X}}{\mathrm{V}}\right) \\ \mathrm{Comparing} \mathrm{equations} \left(1\right) \mathrm{and} \left(2\right), \mathrm{we} \mathrm{get} \\ \mathrm{a}={10}^{-4},2\mathrm{\pi n}=60 and V =30 m/s \\ \mathrm{or} \mathrm{n}=(30/\mathrm{\pi })\text{ and }\frac{2\mathrm{\pi }}{\mathrm{\lambda }}=2 \\ \mathrm{So} \mathrm{we} \mathrm{have} \mathrm{\lambda }=\mathrm{\pi }\text{ metre. } \end{gathered}$$