Ripple tank

A ripple tank is a shallow bowl filled with water. It has a speaker beneath it that sends out sound waves, which make the water ripple. You can use it to study the patterns and speeds of waves in water. Start by putting some small particles, like sand or tiny stones, into the bowl of water. When you turn on the speaker, the sound that it makes creates waves in the water. You can then see the waves move away from the speaker and move around the bowl. The pattern that they form can help you to learn more about waves and how they move.