Capillary waves (ripples) are small amplitude and wavelength waves, commonly seen, for example, when an insect or small particle hits the water surface. They are waves generated due to the interaction of the inertia force of the fluid \(ho\) and the fluid surface tension \(\sigma\). The wavelength is

\[\lambda=2 \pi \sqrt{\frac{\sigma}{ho g}}\]

Find the speed of capillary waves in water and mercury.