There are 2 complete waves shown in the diagram. The wavelength is the length of one wave, 40 cm. The amplitude is the height of the wave, 10 cm. A displacement-time graph shows how the ...

Be careful with this quantity - the centre line is not always given in a diagram. Amplitude is measured in metres (\(m\)). The greater the amplitude of a wave then the more energy it is carrying.

Amplitude modulation (AM) is also widely used to alter a carrier wave to transmit data. For example, in AM radio, the voltage (amplitude) of a carrier with a fixed center frequency (the station's ...