Question

Please help me I really need help!!! can someone please put this in order here are the options: Amplitude, Crest, Trough, and Wavelength picture down below.

Answer 1

The first arrow, pointing to the hill is the crest, the one pointing to the U is a trough, the one pointing to the red line between the hills, crests, is a wavelength, and the one pointing to the blue arrow as the height of a crest is the amplitude.