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GCSE Questions: Medical Physics

- scanning and therapy

Q9. Ultrasound can be used to produce an image of an unborn baby.

 

(a) What is ultrasound?

Sound with a higher frequency than humans can hear (20,000 Hz)

[1 mark]

(b) What happens to the ultrasound when it reaches the skin of an unborn baby? Tick one of the following:

It is all reflected and none is transmitted.  
Some is reflected and some is transmitted.
None is reflected and it is all transmitted.  

[1 mark]

(c) Tick a medical use of ultrasound.

breaking up kidney stones
treating cancer  
destroying bacteria  

(Total 3 marks)