Figure 14.2 The figure shows a wave in a rope with two points labelled A and B.
-A harmonic wave is travelling to the right on a long, stretched rope. Two points on the rope are labelled A and B (see Fig. 14.2). When the wave moves a little to the right, how do these two points move?
A)Both A and B move to the right.
B)Point A moves to the right and B to the left.
C)Point A moves down and B up.
D)Point A moves up and B down.

Question

Figure 14.2  The figure shows a wave in a rope with two points labelled A and B.
-A harmonic wave is travelling to the right on a long, stretched rope. Two points on the rope are labelled A and B (see Fig. 14.2). When the wave moves a little to the right, how do these two points move?
A)Both A and B move to the right. 
B)Point A moves to the right and B to the left. 
C)Point A moves down and B up. 
D)Point A moves up and B down.

Quizplus · Accepted Answer

In a harmonic wave traveling through a rope, points on the rope move perpendicular to the direction of the wave's travel. If point A is moving up, then point B, being at a different phase of the wave, moves down, reflecting the oscillatory nature of the wave.

Figure 142 the Figure Shows a Wave in a Rope