Given that` y = A sin [((2 pi )/(lambda)(ct - x))]` where` y` and `x` are measured in metres ,Which of the following statements is true ?

Options

A. The unit of ` lambda`is same as that of` x `and` A`
B. The unit of `lambda ` is same as that of `x` but not of ` A`
C. The unit of c is same as that of `(2 pi)/(lambda)`
D. The unit of `(a -x )` is same as that of `(2 pi)/(lambda)`

Answer

A

Explanation

` :.(2 pi r)/(lambda)` is dimensionless
`:. [lambda] = [x] = [L] = [A]`