I don't have my textbook any more, but I remember a question in there about this. I think it asked for the difference between people in a stadium 'doing the wave', and a real transverse wave. I couldn't really think of why they're different. I mean they're pretty similar, right? The people 'doing the wave' stand up and sit down, simulating the effects of molecules moving up and down in a transverse wave. What's the difference though? Could someone help soon please? Thanks in advance.