(5, 7) −
The finest square figure here. The lines crowd so closely that the sand needs a slow, steady settle to keep them apart.
- Plate
- Square, free edges
- Mode numbers
- m = 5, n = 7, minus combination
- Shape
- cos(5πx/a)cos(7πy/a) − cos(7πx/a)cos(5πy/a)
- Wavenumber k·a
- 27.03 (a = 240 mm)
- Frequency
- 3,120 Hz on the reference plate