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    17) Two students demonstrate standing waves to the rest of the class using a rope.
    The diagram shows the appearance of the standing wave on the rope at one instant.
    Each part of the rope is at its maximum displacement.
    (a) (i) Mark the position of one node on the diagram. Label this point N.
    Attachment 728762
    (ii) The arrow at point X shows the direction in which the point X is about to move. Add arrows to the diagram to show the directions in which points Y and Z are about to move.

    can someone please explain me why "y" moves up and "z" moves down.
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     Official Rep
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