The amplitude of a wave is a measure of the displacement of the wave from its rest position. We can determine a number of wave properties from the graph. The line through the center of the wave is the resting position of the medium if there was no wave passing through. In this picture you can see that the highest point on the graph of the wave is called the crest and the lowest point is called the trough. The vertical axis is the amplitude of the wave while the horizontal axis can be either distance or time. When drawing a wave or looking at a wave on a graph, we draw the wave as a snapshot in time. Each of these properties is described in more detail below. They include amplitude, frequency, period, wavelength, speed, and phase. There are many properties that scientists use to describe waves.
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