A stationary wave is set up in the air column of a closed pipe. At the closes end of the pipe _____________________?

(A) always an node in formed ()
(B) always an antinode is formed (X)
(C) neither node nor antinode is formed (X)
(D) sometimes a node and sometimes an antinode is formed (X)

Answers: A stationary wave is set up in the air column of a closed pipe. At the closes end of the pipe always an node in formed.