- When the amplitude of an electromagnetic wave of a specific wavelength increases so does the overall distance between the peak and the trough of the wave.
- The measurement taken between the topmost point on a wave (the peak) and the centre line of the wave is called peak amplitude.
- Amplitude is measured in metres (m).
- The greater the amplitude of a wave, the more energy it carries.
- When amplitude increases so does the perceived vividness of a colour.
- Whilst the perceived brightness of a colour depends on the amplitude of a light wave, brightness is also somewhat influenced by wavelength. So for example yellows tend to look brighter than reds or blues.