Assuming its "resting" is the place in the middle of the wave crest and trough, the distance between the crest and the middle line would be considered its amplitude. The height of a wave is the distance between the crest and the trough, and wavelength is the distance between two crests.
I'm working on the assignment rn. But here are some clues to help you.
Answer:
The reaction of iodine and starch turns the solution blue
