Question

draw and label the parts of a wave
what is a?
trough
crest
wavelength
amplitude

Explanation:

In a wave diagram, the "amplitude" is the maximum displacement of a point on the wave from its rest position (the midline). The label "A" in the wave graph here corresponds to the amplitude as it measures the height from the midline to the peak (or trough) of the wave. The other options: "trough" is the lowest point, "crest" is the highest point, and "wavelength" is the distance between two consecutive crests (or troughs). So A represents amplitude.

Answer:

amplitude