1 2 3 4 5 E ? _ Fill a graduated cylinder with water. _ Place a tube inside (making the end in the water a closed end}. _ Sound the tuning fork of: 1024 Hz}. _ Place it close to the open end of the closed air column. _ Raise it from the water until you hear a loud sound (resonance). . Measure the length of the air column. This is the resonant length {L1}. _ Repeat the procedure until you hear the second resonant length (L2)