A-LevelPhysicsWaves9702/12 · May/June 2019 · Q241 Mark
A wave moves along the surface of water. The diagram shows the variation of displacement s with distance along the wave at time t = 0. [Figure 24.1] Which graph best shows the variation with time t of the displacement s of the point P on the wave?
This question uses a diagram from the original paper, which isn't shown here. Open the full paper from the past papers archive to see it.
A[Diagram A showing s versus t as a sine wave starting at s=0 and initially increasing]
B[Diagram B showing s versus t as a sine wave starting at s=0 and initially decreasing]
C[Diagram C showing s versus t as a sine wave starting at a positive maximum]
D[Diagram D showing s versus t as a sine wave starting at a negative maximum]
✓ Correct answer
D: [Diagram D showing s versus t as a sine wave starting at a negative maximum]
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