Ultrasound

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1. What is an advantage of using Ultrasound waves instead of X-rays for medical scanning?

  • Ultrasound waves can be used to treat cancerous cells.
  • Ultrasound waves produce better images than X-rays.
  • Ultrasound waves are non-ionising and therefore harmless when used for scanning.
  • Ultrasound scanners are cheaper to use than X-ray machines.
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2. What frequency range of sound waves can the human ear hear?

  • 10Hz to 10 000Hz
  • 20Hz to 20 000Hz
  • 50Hz to 50 000Hz
  • 5Hz to 5 000Hz

3. What are Ultrasound waves used for?

  • To treat illness.
  • Prenatal scans of a baby in the womb.
  • To detect broken bones.
  • To detect cancerous cells.

4. Why are Ultrasound waves not useful for examining lungs?

  • Because they do not travel in air.
  • Because the lungs are surrounded by the ribs which reflects the Ultrasound waves.
  • Because the lungs are constantly contracting due to the patient breathing.
  • Because the Ultrasound waves are not strong enough to produce an image of the lungs.

5. What happens to Ultrasound waves after a transducer has emitted pulses?

  • It is partially reflected from the different tissue boundaries in its path and returns to the transducer to create an image on a screen.
  • They travel through tissue to the other side of the body.
  • They produce images of broken bones on a screen because the waves pass through things that are not dense like bone.
  • The waves return to the transducer all at once to create an image on a screen.
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