The Figures Show Standing Waves of Sound in Six Organ

Multiple Choice

The figures show standing waves of sound in six organ pipes of the same length.Each pipe has one end open and the other end closed.Note: some of the figures show situations that are not possible.

-Which of the figures do not illustrate possible resonant situations?

A) 1 and 4
B) 2 and 3
C) 4 and 5
D) 5 and 6
E) 4,5,and 6