Just wanted to clarify something from the book. there are two ways to looking at standing waves in an air tube or even an aluminum rod.. Displacement nodes and anti-nodes and another way.. pressure nodes and anit-nodes.. For the questions in the lab, we are going to just deal with displacement nodes and anit-nodes and not with pressure… A displacement anti-node is a place on a standing wave that is moving or displaced like crazy.(ironically, that place does not undergo very much pressure change so it’s a pressure node) .. A displacement node is a place on a standing wave that is quiet or not displaced at all. (ironically, the node for displacement undergoes the greatest pressure variation so it’s a pressure anti-node) . Again, if I ask you to sketch a standing wave in an air column, I mean displacement sketch The following link might help: http://www.acs.psu.edu/drussell/Demos/StandingWaves/StandingWaves.html
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