With capillary waves I need to calculate where surface standing waves will occur. Assume mediums are pure water and air. Assume the capillary waves are bounded in a box such that the wavelength matches the height of the water and width/length of the box. Assume effects of gravity and interference are neglible. Assume the box is vibrated sinusoidally from the bottom at a frequency of 100KHz. The standing waves will appear on the surface of the water in a triangular lattice (I believe). But what distance between nodes? I am too long in the tooth to do the calculations myself, so any pointers, websites, resources, thoughts would be welcome.