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2 marksPhysics of the Ear and Eye

CAPE Physics Unit 1 · 2017 · Paper 2 · Question 5(a)(ii)

What TWO properties of the human ear makes the decibel (dB) scale particularly useful?

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  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)(iii)Determine the intensity of such a sound in W m⁻².[6 marks]
  3. 5(b)(i)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.[2 marks]
  4. 5(b)(ii)Determine the frequency setting of the signal generator.[3 marks]

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