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3 marksRefraction

CSEC Physics · 1988 · Paper 2 · Question 5(b)(iii)

Wave fronts in deep water strike a boundary AB with shallow water. The incident wavefront separation is 1.5 cm, sin θ = 4/5, and the refractive index into shallow water is 2.

Calculate the value of ϕ, the angle of refraction of the waves.

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Other parts of this question

  1. 5(a)(i)Describe the motion of the source S and state its frequency.[2 marks]
  2. 5(a)(ii)With reference to the diagram, write TWO statements describing the motion and frequency of a particle, P, of the medium (water).[2 marks]
  3. 5(a)(iii)Calculate the velocity of the travelling wave.[2 marks]
  4. 5(a)(iv)State TWO differences between travelling and standing waves.[2 marks]
  5. 5(a)(v)With reference to the diagram, mention ONE step that could be taken to obtain a standing wave from the travelling ripples in the trough.[1 mark]
  6. 5(b)(i)Calculate the wavelength in shallow water.[2 marks]
  7. 5(b)(ii)Complete the diagram to show the refracted wave fronts with their correct separation.[3 marks]
  8. 5(b)(iv)Calculate the velocity of the wave fronts in shallow water if the velocity in deep water is 4 cm s⁻¹.[3 marks]

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