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All waves can be made by adding up sine waves. The sine wave has a pattern that repeats. The length of this repeating piece of the sine wave is called the wavelength. The wavelength can be found by measuring the length or distance between one peak of a sine wave and the next peak. The wavelength can be found in many other ways too.
Waves made of Sine Waves
All of these waves are sums of signals.
Properties of Sine Waves
The frequency of a sine wave is the number of oscillations a wave has in a certain period of time, for example one second.