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2 marksProperties of Waves

CAPE Physics Unit 1 · 2017 · Paper 2 · Question 5(b)(i)

A loudspeaker connected to an audio frequency signal generator/amplifier is set up 3 metres in front of a large flat wall. A small microphone detects regions of high and low intensity as it moves between the speaker and the wall.

Explain why there are positions between the speaker and the wall where intensity is a minimum, and why these minima do NOT actually have zero intensity.

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Other parts of this question

  1. 5(a)(i)Distinguish between the terms 'threshold of hearing' and 'threshold of pain' when applied to the intensity of sound.[2 marks]
  2. 5(a)(ii)What TWO properties of the human ear makes the decibel (dB) scale particularly useful?[2 marks]
  3. 5(a)(iii)Determine the intensity of such a sound in W m⁻².[6 marks]
  4. 5(b)(ii)Determine the frequency setting of the signal generator.[3 marks]

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