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CAIE IGCSE Physics Defining Ultrasound

Practise defining ultrasound by its frequency threshold and classify a stated sound from its numerical frequency, audibility and longitudinal nature.

Syllabus
2026–2028
Course
Physics 0625

Exam points

  • define ultrasound as sound above 20 kHz, equivalent to more than 20 000 Hz
  • classify a numerical frequency against the threshold and state that humans cannot hear it
  • retain sound's longitudinal nature when comparing ultrasound with audible waves

3.4.9—Ultrasound as sound with a frequency question 1

[Maximum number: 1]

State a possible frequency for an ultrasound wave.

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