Oscillation involves no net movement, only movement in place yet individual points in the wave medium are oscillating even as the overall wave pattern moves. It is related to oscillation, a type of harmonic motion in one or more dimensions. Wave motion is a type of harmonic motion that carries energy from one place to another without actually moving any matter. Sound and light are both examples of energy, and both are carried on waves. HOW IT WORKS Wave Motion and Its Properties Doppler radar provides information concerning weather patterns, but some people experience it in a less pleasant way: when a police officer uses it to measure their driving speed before writing a ticket. Closer to home, principles relating to the Doppler effect find application in radar technology. Astronomers use it, for instance, to gauge the movement of stars relative to Earth. The Doppler effect, which occurs both in sound and electromagnetic waves -including light waves -has a number of applications. This is an example of the Doppler effect: the change in the observed frequency of a wave when the source of the wave is moving with respect to the observer. Then, as it passes, the pitch suddenly lowers perceptibly. For example, if one is standing on a street corner and an ambulance approaches with its siren blaring, the sound of the siren steadily gains in pitch as it comes closer. Almost everyone has experienced the Doppler effect, though perhaps without knowing what causes it.
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