MCAT Physics Question 99: Answer and Explanation

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Question: 99

9. In some forms of otosclerosis, the stapedial foot plate, which transmits vibrations from the bones of the middle ear to the fluid within the cochlea, can become fixed in position. This limits the displacement of the stapedial foot plate during vibration. Based on this mechanism, which of the following symptoms would most likely be seen in an individual with otosclerosis?

  • A. An increase in the perceived volume of sounds
  • B. A decrease in the perceived volume of sounds
  • C. An increase in the perceived pitch of sounds
  • D. A decrease in the perceived pitch of sounds

Correct Answer: B

Explanation:

Saying that the stapedial footplate has limited displacement during vibration is another way of stating that the amplitude of the vibration has been decreased. Because amplitude is related to intensity, and intensity is related to sound level, the perceived sound level (volume) will be decreased as well. Pitch, described in choices (C) and (D), is related to the frequency of a sound, not its amplitude.

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