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8 marksProperties of Waves

CAPE Physics Unit 1 · 2002 · Paper 2 · Question 7(c)(i)

The velocity of a transverse wave on a wire stretched between two fixed points is V = sqrt(T/μ), where T is the tension and μ is the mass per unit length. A piano wire is 75 cm long and of mass 7.5 g. The wire is stretched with a tension of 400 N.

Use the equation above to calculate the velocity of a wave along the string.

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Other parts of this question

  1. 7(a)What is the speed of the wave?[4 marks]
  2. 7(b)(i)Describe, with the aid of a labelled diagram, an experiment to demonstrate interference of sound waves.[8 marks]
  3. 7(b)(ii)Why are sound waves described as progressive longitudinal waves?[8 marks]
  4. 7(c)(ii)Calculate this frequency. What can you say about the wavelength of the wave?[8 marks]
  5. 7(c)(iii)Calculate the change in the intensity level when the power output from a piano changes from 100 mW to 200 mW.[8 marks]

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