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Physics of the ear (A-level only)

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Question 9
1.

Define sound intensity.

[1]
2.

The intensity level, in dB\text{dB}dB, of a sound is LLL. What is the intensity level of a sound with half the intensity?

Select one option:

  • L−2L - 2L−2
  • L−3L - 3L−3
  • L−10L - 10L−10
  • 0.5L
  • L2L^2L2
  • L−1.5L - 1.5L−1.5
[1]
3.

The amplitude of the pressure wave at the oval window of an ear is 18 times greater than at the tympanic membrane.

Calculate the ratio:

force on oval windowforce on tympanic membrane \frac{\text{force on oval window}}{\text{force on tympanic membrane}} force on tympanic membraneforce on oval window​
  • area of oval window=3.2×10−6 m2\text{area of oval window} = 3.2 \times 10^{-6}\text{ m}^2area of oval window=3.2×10−6 m2
  • area of tympanic membrane=6.4×10−5 m2\text{area of tympanic membrane} = 6.4 \times 10^{-5}\text{ m}^2area of tympanic membrane=6.4×10−5 m2
[2]

Physics of the ear (A-level only) Questions

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