May/June 2026 Paper 23

2026 · 40 questions · 40 parts · 40 marks

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18Sound Doppler EffectEasy1 mark
Which statements about ultrasound are correct?
  1. 1
    They diffract less than audible sound waves.
  2. 2
    They are used in the medical scanning of soft tissues.
  3. 3
    They travel at a smaller speed in air than audible sound waves.