6. can be measured from crest to crest or trough to trough in a transverse wave.\na wavelength\nb wave…

6. can be measured from crest to crest or trough to trough in a transverse wave.\na wavelength\nb wave speed\nc amplitude\nd frequency
Answer
Brief Explanations:
Wavelength is defined as the distance between two consecutive crests or two consecutive troughs in a wave. Wave speed is about how fast the wave travels, amplitude is the maximum displacement from the equilibrium position, and frequency is the number of waves passing a point per unit - time.
Answer:
A. Wavelength