The Open Door Web Site
Waves

Graph of Displacement of the Medium against Distance along a Typical Wave
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The maximum displacement of the medium from the equilibrium position is called the amplitude of the wave.

l is the wavelength; this is the distance moved by the disturbance during one time period.

This graph could have many different shapes; the graph shown here is similar to a graph of sine of angle against angle. For this reason, waves of this shape are called sine waves.

For a transverse sine wave, this graph can be considered to be a picture of the wave at a given instant in time. However, it should be remembered that the graph could represent a longitudinal wave.

Graph of Displacement of a Particular Point in the Medium against Time for a Typical Wave
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T, is the time for one "cycle" of the wave. This is called the time period.

The frequency, f, of the wave is the number of cycles per second. This is determined by the source of the waves.

 

© David Hoult 2008