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Physics of the ear (A-level only)

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Question 8
a.

Define sound intensity.

[1]
b.

The intensity level, in dB\text{dB}dB, of a sound is LLL. What is the intensity level of a sound when its intensity is increased by a factor of 4?

Select one option:

  • L+2L + 2L+2
  • L+4L + 4L+4
  • L+6L + 6L+6
  • L+12L + 12L+12
  • 4L4L4L
  • L4L^4L4
[1]
c.

The amplitude of the pressure wave at the oval window of a mammalian ear is 222222 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=2.8×10−6 m2\text{area of oval window} = 2.8 \times 10^{-6}\text{ m}^2area of oval window=2.8×10−6 m2
  • area of tympanic membrane=7.0×10−5 m2\text{area of tympanic membrane} = 7.0 \times 10^{-5}\text{ m}^2area of tympanic membrane=7.0×10−5 m2
[2]

Physics of the ear (A-level only) Questions

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