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

An organ pipe open at one end is vibrating in first overtone and is in resonance with another pipe open at both ends and vibrating in third harmonic. The ratio of length of two pipes is–