Physics - Unit & Dimension Question with Solution | TestHub

Here $\frac{2\pi }{\lambda }(ct-x)$ is dimensionless. Hence, $\frac{ct}{\lambda }$ is also dimensionless and unit of $ct$ is same as that of $x$. Therefore, unit of $\lambda$ is same as that of $x$. Also unit of $y$ is same as that of $A$, which is also the unit of $x$.