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2 marksPhysics of the Ear and Eye

CAPE Physics Unit 1 · May/June 2021 · Paper 2 · Question 2(e)(iii)

At a party, the average sound intensity level is 90 dB. Determine the intensity in W m⁻².

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Other parts of this question

  1. 2(a)(i)Define the term amplitude.[1 mark]
  2. 2(a)(ii)Define the term period.[1 mark]
  3. 2(b)State the two conditions necessary for simple harmonic motion (SHM).[2 marks]
  4. 2(c)(i)Calculate the mass of the wooden block.[4 marks]
  5. 2(c)(ii)Calculate the angular frequency of the oscillations.[3 marks]
  6. 2(c)(iii)Calculate the maximum velocity of the wooden block.[3 marks]
  7. 2(d)(i)The amplitude of oscillation decreases gradually by 0.2 cm with each oscillation. On the axes in Figure 4, sketch the first five oscillations.[5 marks]
  8. 2(d)(ii)Identify the phenomenon depicted by the waveform sketched in (d)(i) and state two real-life situations where it occurs.[3 marks]
  9. 2(e)(i)Define the term 'threshold of hearing' and state its value for a healthy young adult.[2 marks]
  10. 2(e)(ii)Write an equation showing the relationship between sound intensity level in dB and the threshold of hearing, I₀.[1 mark]
  11. 2(e)(iv)A student attends the party for 3 hours. Calculate the amount of energy incident on the eardrum if its surface area is 0.5 cm².[3 marks]

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