We experts here on the Science Buddies Ask An Expert forum try to help students by answering specific questions about their science projects.
The questions you have asked are fairly specific, but very basic questions about the physics of waves, not specific about an experiment you are running, or plan to run.
I would like to help you, but need to suggest that first you do some basic research about waves and wave theory. After you have decided how you want to run your science project, we can help you with specific questions you have.
I wasn't able to find anything on the Science Buddies web site that addresses wave theory in general, so I can't make a recommendation there. But I did find a few web sites you might find of help in answering your questions. Try these:http://www.onr.navy.mil/focus/ocean/motion/waves1.htmhttp://kingfish.coastal.edu/biology/sgi ... motion.htmhttp://www.montereyinstitute.org/noaa/lesson09.html
Good luck with your research, and have fun with whatever science project you decide to do.