Previous section: 2.1 What are waves?
The characteristic height of a peak and depth of a trough is called the amplitude of the wave. The vertical distance between the bottom of the trough and the top of the peak is twice the amplitude. We use symbols agreed upon by convention to label the characteristic quantities of the waves. Normally the letter A is used for the amplitude of a wave. The units of amplitude are meters (m).
Light is a special case; it exhibits wave-like properties but does not require a medium through which to propagate.
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Next section: 2.1.2 Characteristics of Waves: Wavelength