Question

What is the distance from the crest to the equilibrium of a wave called?

Answer 1

The answer would be amplitude. Amplitude is the largest displacement of a wave particle from its equilibrium position.

Answer 2

Amplitude

Step-by-step explanation:

The amplitude of a wave is a measure of the maximum variation of a physical quantity that changes periodically. It is the distance between the wave crest to its equilibrium point. For a mechanical wave the amplitude is a displacement and has units of length.