(1, 2) −
The lowest mismatched pair. Sand holds the diagonals and clears the corners.
- Plate
- Square, free edges
- Mode numbers
- m = 1, n = 2, minus combination
- Shape
- cos(1πx/a)cos(2πy/a) − cos(2πx/a)cos(1πy/a)
- Wavenumber k·a
- 7.02 (a = 240 mm)
- Frequency
- 211 Hz on the reference plate