What causes sound to be effected by the thickness and length of its vibrating object? Is it that the length that the sound travels along giving more rotational room? assuming it is like a string plucked? Does sound have a standard "length" that is compressed or stretched dependent on the distance to which its receptor that ables the sound to be produce? Im not sure if this is making sense- but I just need to understand WHY length and thickness EFFECT the pitch of sound occurred. I know that the thicker and longer the transmission medium, the lower the pitch. Also- the effects of different materials? I am curious if there is a way to test the production of sound in a contained space and if that makes sound that would normally be lower in an open environment more restricted, frequency waves pushed closer together causing it to be higher? So my knowledge on sound is really limited, i'm just trying to get an understand of the causes for the effects of thickness, length, and mediums. Any information would be helpful! Thank you.