The wavelength of a wave is the distance between two corresponding points on back-to-back cycles of a wave. The energy of the wave also varies in direct proportion to the amplitude of the wave. For example, when looking at a sound wave, the amplitude will measure the loudness of the sound. The amplitude is a measure of the strength or intensity of the wave. The amplitude is shown on the graph below.Īmplitude is generally calculated by looking on a graph of a wave and measuring the height of the wave from the resting position. 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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