If the air column in a tube, open at both ends, is set in vibration , what harmonics are possible ?

The air column in a long tube, closed at one end, is set in vibration. What harmonics are possible in the vibrating air column ?

When an air column in a tube open at both the ends is set into vibration with

Show that the fundamental frequency of vibrations of the air column in a tube open at both is equal to double the fundamental frequency in a tube of the same length and closed at one end.

An organ pipe A closed at one ends is allowed to vibrate in its first harmonic and another pipe B open at both ends is allowed to vibrate in its third harmonic. Both A and B are in resonance with a given tuning fork. The ratio of the length of A and B is

The air column in a pipe open at both ends vibrates with the frequency of third overtone. It is found that air in th pipe has