If we study the vibration of a pipe open at both ends, then the following statements is not true

If we study the vibration of a pipe open at both ends, which of the following statements is not true?

If we study the vibration of a pipe open at both ends, which of the following statements is not true?

If we study the vibration of a pipe open at both ends, then which of the following statement is not true?

An organ pipe, open at both ends, contains

An organ pipe, open at both ends, contains

An organ pipe, open at both ends, contains

The waves set up in pipes open at both the ends are

The frequency of third overtone of a pipe closed at one end , is in unison with the fifth overtone of a pipe open at both the ends. Then the ratio of length of the pipe closed at one end to the open at both the ends is