Quelpr
8 marksPhysics of the Ear and Eye

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

If the wire has length l, the fundamental frequency is given by f = v / (2l), where v is the velocity of the wave.

Calculate the change in the intensity level when the power output from a piano changes from 100 mW to 200 mW.

The mark scheme is shown once you've answered.

Practise this question

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)(i)Use the equation above to calculate the velocity of a wave along the string.[8 marks]
  5. 7(c)(ii)Calculate this frequency. What can you say about the wavelength of the wave?[8 marks]

More practice: the rest of this paper · more Physics of the Ear and Eye questions · all CAPE Physics Unit 1 past papers