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5 marksProperties of Waves

CAPE Physics Unit 1 · 1999 · Paper 2 · Question 6(a)(i)

Figure 4 shows an overhead view of a ripple tank with two dippers, X and Y, vibrating at 5 Hz. Corks are at P and Q. Arcs represent wave crests. The distance from Y to P is 15 cm.

Describe how the displacements of P and Q vary with time.

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Other parts of this question

  1. 6(a)(ii)Calculate the speed of the waves.[1 mark]
  2. 6(b)Describe an experiment to demonstrate the diffraction of plane water waves in a ripple tank for a narrow gap. Draw a diagram of what you would expect to see…[3 marks]
  3. 6(c)Explain why this occurs.[4 marks]
  4. 6(d)Write down expressions for displacement and velocity of the water molecules with time. Hence, deduce an expression for the power due to the water waves in…[5 marks]
  5. 6(e)Directly below EACH figure in your answer booklet, draw on the dotted line, the state of the water surface one quarter of a period later.[3 marks]

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