Hello :) We did a lab in class and the lab was about resonance of air columns. We used a tube and filled it with water. Then we held a tuning fork above the tube to see at which points the resonance occurs. If a vibrating fork is held over the open end of the column, the loudness of the sound will increase very sharply at specific lengths of the tube. Now the problem is I have to come up with a real-life application of resonace of sound in tubes, and I can't seem to think of an example. Help me!