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2. What are rarefactions?

  • Regions of low pressure
  • Regions of high pressure
  • Regions of no pressure

3. What type of wave is ultrasound?

  • Longitudinal
  • Transverse

4. What happens to ultrasound at each boundary in a body?

  • They are all reflected
  • Some are reflected and the rest are transmitted
  • Some are transmitted the rest are reflected
  • They are all transmitted

5. Does ultrasound damage cells?

  • No
  • Yes
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