IB Physics Internal Assessment Exemplar: How does the length of the pipe affect the natural frequency of the air column in the pipe at constant air temperature when the pipe is: a) open at both ends and air is blown close to one end? b) open at one and closed at the other end, and air is blown close to the open end? Natural frequency is the frequency that has the highest intensity and is the loudest of all frequencies which are produced with air blowing. | RevisionDojo