1. What, other than medical uses, do Ultrasound waves have?
- Detecting fish in the sea.
- Detecting metal under the sand (metal detectors).
- Detecting oil on the sea bed.
- Cleaning glass.
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2. Why are Ultrasound waves not useful for examining lungs?
- 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.
- Because they do not travel in air.
- Because the lungs are surrounded by the ribs which reflects the Ultrasound waves.
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. What frequency range of sound waves can the human ear hear?
- 20Hz to 20 000Hz
- 5Hz to 5 000Hz
- 50Hz to 50 000Hz
- 10Hz to 10 000Hz
5. 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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