AQA GCSE Physics

Revision Notes

6.1.11 Ultrasound

Ultrasound

  • Ultrasound is defined as:

Sound waves with a frequency above the human hearing range of 20 000 Hz

  • The human ear can hear frequencies between 20 Hz and 20 000 Hz

Range of human hearing, IGCSE & GCSE Physics revision notes

The human ear can detect sounds between around 20 and 20 000 Hz in frequency with a peak sensitivity at around 4000 Hz

  • When meeting a boundary between two media ultrasound may be:
    • Partially reflected
    • Partially transmitted
    • Partially absorbed
  • The percentage that is reflected or transmitted depends on the two media at the boundary
    • An air and glass boundary will have different percentages compared to an air and wall boundary
  • The percentage of the wave reflected is greatest when the difference in speed of sound between the media is large
    • For example, when sound in air hits a brick boundary, most of the sound is reflected because waves travel much faster in brick than in air

Author: Katie

Katie has always been passionate about the sciences, and completed a degree in Astrophysics at Sheffield University. She decided that she wanted to inspire other young people, so moved to Bristol to complete a PGCE in Secondary Science. She particularly loves creating fun and absorbing materials to help students achieve their exam potential.
Close

Join Save My Exams

Download all our Revision Notes as PDFs

Try a Free Sample of our revision notes as a printable PDF.

Join Now
Already a member?
Go to Top