Decibels probably
The height of a wave is also known as its amplitude. More generally, the amplitude is "how much some measurement changes" - this measurement need not always be a height.
The characteristic measurement identified by the letter A on the diagram is the amplitude of the wave. Amplitude refers to the maximum displacement of a wave from its equilibrium position.
Distance between the peakes and troughs in a waves oscillations.
You don't. Hz (always capitalized) is the unit for measuring frequency or pitch. dB is the unit for measuring amplitude or relative loudness of the sound. You cannot convert a frequency measurement to an amplitude measurement.
Amperes Hertz Watts
The measurement of how loud or soft a sound is called its amplitude or intensity. This is typically measured in decibels (dB).
The vertical distance between a wave's midpoint and its crest or trough is called is peak amplitude. This differentiates this measurement from the vertical distance from a crest to a trough, which is called its peak-to-peak amplitude.
The trough of a wave appears to have a negative amplitude. However, because amplitude is a distance measurement, which is a scalar quantity having only magnitude, it has no sign.
The measurement of a wave's magnitude of oscillation is called amplitude. It represents the maximum displacement of a particle in a medium from its rest position during one complete wave cycle.
measurement of the amplitude of the largest seismic waves
The vertical axis on an oscilloscope is used to measure the amplitude of a waveform. This axis represents the voltage level of the signal being displayed on the screen.
We need a length or distance measurement here. The unit is meter or a part of it, like centimeter, millimeter.