Question

which is shown by the letter x?
o trough
o amplitude
o crest
o wavelennth

Explanation:

In a wave, the crest is the highest - point. The letter X is pointing to the highest - point of the wave. A trough is the lowest - point, amplitude is the distance from the rest position to a crest or trough, and wavelength is the distance between two consecutive crests or troughs.

Answer:

C. crest