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I see your doing the past paper :)
Ultrasound is very (ultra) high frequency/pitch sound used for cleaning and pre-natal scanning.
It says: RADIATION because it is longitudinal radiation, however, if you answer with any of these answers, you will still be awarded the mark.
Here is the Mark Scheme for that very paper:
CLICK HERE FOR THE MARK SCHEME IN A NEW TAB
thank uuuuuuuuuuuuuuuuu =)