How can I do this?

[giulia.prevedello]

Hi all!
first of all I apologize for my bad english. I'm attending a web designer course and I have to do some execises with photoshop. I have to replicate this image, but I'm not able to obtain the effect of transparency on the "wave" over the lady . How can I do that? Thanks a lot

 

[IamSam]

Hello and welcome.

Place the wave photo layer over the lady photo layer and set it's blending mode to "screen".