A pipe has one end open and the one end closed. Where must the node be located in order for a standing wave to occur? (The left end, B, is the open one and the right end, A, is the closed one.)

Answer 1

The antinode is at the open end, the node at the closed end.

Answer 2

Are there any times when the node could be in the middle and not at either of the ends?

Answer 3

yes, but at each harmoic, there will be one node at the closed end, and an antinode at the open.