waves at waves....
![](http://upload.wikimedia.org/wikipedia/en/thumb/e/e9/Wave.png/400px-Wave.png)
The wavelength (denoted as λ) is the distance between two sequential crests (or troughs). This generally has the unit of meters; it is also commonly measured in nanometers for the optical part of the electromagnetic spectrum.![](http://upload.wikimedia.org/wikipedia/commons/7/74/Simple_harmonic_motion_animation.gif)
![](http://upload.wikimedia.org/wikipedia/commons/7/74/Simple_harmonic_motion_animation.gif)
The period T is the time for one complete cycle for an oscillation of a wave. The frequency f (also frequently denoted as ν) is how many periods per unit time (for example one second) and is measured in hertz.
Propagation through strings
The speed of a wave traveling along a string (v) is directly proportional to the square root of the tension (T) over the linear density (μ):![](http://upload.wikimedia.org/math/f/c/e/fce5c07a0d59700df171beee1218356f.png)
The speed of a wave traveling along a string (v) is directly proportional to the square root of the tension (T) over the linear density (μ):
![](http://upload.wikimedia.org/math/f/c/e/fce5c07a0d59700df171beee1218356f.png)
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