May/June 2026 Paper 13

2026 · 40 questions · 40 parts · 40 marks

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26Wave Properties Wave BehaviourHard1 mark
A student demonstrates a longitudinal wave using a spring that lies on a table.
a spring lying on a table, viewed from above, with point P marked in the middle of the coils
a small pair of perpendicular axes labelled displacement in Y-direction (vertical arrow) and displacement in X-direction (horizontal arrow), defining the two directions used in the graphs below
The X- and Y-directions are shown.
P is a point on the spring.
Which pair of graphs could show the variation with time of the displacement of point P in the X- and Y-directions?
four pairs of graphs, each showing displacement in the X-direction (left) and displacement in the Y-direction (right) against time: in A, the X-direction graph is a sine wave and the Y-direction graph is flat at zero; in B, the X-direction graph is flat at zero and the Y-direction graph is a sine wave; in C, both the X- and Y-direction graphs are sine waves of the same frequency and phase; in D, both the X- and Y-direction graphs are flat at zero