A high power sound wave generator unit plugged into one and of a transparent approx. 1 meter long tube. A standard laboratory signal generator is used to drive sound wave generator and as the frequency is adjusted the various resonance modes are detected by increased loudness of the node.The distance between the transmitter and receiver can be changed by just inserting the rod inside the tube. On placing the cork or polystyrene dust is distributed throughout the tube and at resonance the power gather at the nodes and wavelength can bemeasured