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The unit of `lambda` is same as that of x and A.The unit of `lambda` is same as that of x but may not be same as that of `A`.The unit of `c` is same as that of ` 2 pi // lambda`.The unit of `( c t - x)` is same as that of ` 2 pi // lambda`.

Answer :

BSolution :

Here units of y and A will be same and that of x and `lambda` will be same . `(2 pi)/( lambda) ( ct - x)` is dimensionless. Here `ct// lambda` and `x// lambda` are dimensionless. Unit of ct is same as that of `lambda` or x.