I'm doing a science project and already have covered the fundamentals, but I'm trying to go more in depth.
well i'm suposing your project is about speed and frecuency, you could try mesuring speed sound vs. ligth, i know light is faster but by how much? or you can measured the intensity of the sound wave that affect a liquid on a glass in diferent distance (source of sound ang glass of water) this one can be done with many diferent types of liquids you could even mixed some and then turn on a mp3 with speakers to s see how many waves form on the surface of the liquid or even measured the strumble on the floor or table were the speakers are if you want more info pm me. Hope id help...
I'm not a big fan of the topic, but I hope you are able to find all of the information you are looking for. Does your school subscribe to databases? If they do than they can be really helpful.
Sounds interesting, but your question is vague. What is your science project? What grade level are you? Try this Google search: “Physics of digital sound waves,” and do the same search at the Library.