A ripple tank is a transparent shallow tray of water with a light shining down through it onto a white card below. The light allows you to see the motion of the ripples created on the water's ...

speed of sound in water (m/s) × time taken (s) Sound waves travel at 1,500 m/s in water. The time between sending and receiving a sonar sound pulse that detects a submarine on the seabed is 0.12 s.