.
a. wavelength
b. crests
Troughs
Amplitude
A
B
C
D
A. amplitude.
B. wavelength.
C. frequency.
D. trough.
A. They do not move.
B. They follow the wave along its path.
C. They vibrate in a path parallel to the direction of the motion of the wave.
D. They vibrate in a path perpendicular to the motion of the wave.
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