(3, 5) −
A denser lattice. Ridges of sand narrow as the wavenumber climbs.
- Plate
- Square, free edges
- Mode numbers
- m = 3, n = 5, minus combination
- Shape
- cos(3πx/a)cos(5πy/a) − cos(5πx/a)cos(3πy/a)
- Wavenumber k·a
- 18.32 (a = 240 mm)
- Frequency
- 1,433 Hz on the reference plate