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Cambridge AS & A Level Physics

24.1Production and use of ultrasound

Production and use of ultrasound in Cambridge AS & A Level Physics: what the syllabus expects you to know, the learning objectives and how to practise.
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Learning objectives

What the syllabus expects you to be able to do.

  1. 24.1.1Describe the piezoelectric effect in both directions.
  2. 24.1.2Explain how a piezoelectric transducer generates and detects ultrasound.
  3. 24.1.3Explain how reflected ultrasound pulses at tissue boundaries give diagnostic information.
  4. 24.1.4Define specific acoustic impedance Z = ρc.
  5. 24.1.5Use the intensity reflection coefficient at a boundary.
  6. 24.1.6Recall and use exponential attenuation of ultrasound.

Lessons

  • Ultrasound: production, reflection and attenuation

    50 min

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Sample question

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Production and use of ultrasound: sample question

1 mark

Blood has a density of 1040 kg m−31040\ \text{kg m}^{-3} and the speed of sound in it is 1570 m s−11570\ \text{m s}^{-1}. What is its specific acoustic impedance?

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