The standing wave of the drum
In a standing wave, the position of the vibration node or antinode does not move.
Since the drum has a fixed edge, the edge becomes the node of vibration. The sound varies depending on the drum material and width. The larger and heavier the membrane, the lower the frequency.
![](/lee/contents/standing_wave_kettle_drum_fp.jpg)
If you sprinkle the powder on the drum and vibrate, you can check the appearance of a standing wave. The dust gathers at the nodes of the vibration.
(Fundamentals of Physics-Haliday, Resnick, Walker)