Frequency of Water

In physics class we are learning about waves. We have a ripple tank and there is a machine that produced the waves for us. Here are some of the waves that the machines produced. The machine had a long wooden board. When that moved, it made straight waves. The waves just moved out and bounced off of the other end of the tank. Nothing interfered with it. We placed a curved object in the water. Now the waves bounced off the object and made curved waves. It...