A wave is a disturbance that moves along a medium from one end to the other. The ripple tank wave experiment is observed to cover distance. If the crest of an ocean wave moves a distance of 20 meters in 10 seconds, then the speed of the ocean wave is 2. The faster wave travels a greater distance in the same amount of time.
Sometimes a wave encounters the end of a medium and the presence of a different medium. For example, a wave introduced by a person into one end of a slinky will travel through the slinky and eventually reach the end of the slinky and the presence of the hand of a second person. One behavior that waves undergo at the end of a medium is reflection. The wave will reflect or bounce off the person’s hand. Reflection phenomena are commonly observed with sound waves. When you let out a holler within a canyon, you often hear the echo of the holler. Noah stands 170 meters away from a steep canyon wall.