MCAT Physics Question 94: Answer and Explanation

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Question: 94

4. Ultrasound machines calculate distance based upon:

  • A. intensity of the reflected sound.
  • B. travel time of the reflected sound.
  • C. angle of incidence of the sound.
  • D. the detected frequency of the sound.

Correct Answer: B

Explanation:

While intensity, choice (A), could be used to measure distance, time of travel is an easier indication and most commonly used by ultrasound machines. Apparent frequency, choice (D), is only used in Doppler ultrasound, and not to calculate distance. Angle of incidence, choice (C), can be used to position various structures on the screen of an ultrasound, but is not used to calculate distance.

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