Physics › Section L · Sound and hearing › Topic L.5
Hearing and ultrasound
Your ear turns pressure waves into nerve signals using a resonating tube, a pair of levers and a frequency-sorting membrane. Sound above the range of hearing, ultrasound, lets doctors look inside the body with nothing more than echoes.
In this topic
- The range of human hearing
- What you hear and what is measured
- The ear as a physics machine
- Worked example: the ear's built-in amplifiers
- Hearing loss and its remedies
- Seeing with echoes
- Acoustic impedance and reflection
- Worked example: depth and reflection
- Detail, depth and Doppler
- Ultrasound in medicine
- Common mistakes to avoid
- Key takeaways
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