Key term for Edexcel GCSE Physics, used in Sound and Ultrasound.
Longitudinal sound waves with a frequency above the human hearing range (greater than 20,000 Hz).
Ultrasound appears in Edexcel GCSE Physics revision content for Waves, especially Sound and Ultrasound and Uses of Ultrasound/Infrasound.
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Waves
Sound and Ultrasound • Sound Conversion and Hearing
