Sound waves (HT ONLY)

Sound waves can travel through solids and liquids by causing vibrations in them.
We detect sound waves using our ears:
- When sound waves enter the ear, they cause the eardrum to vibrate.
- This causes small bones in the ear to vibrate.
- These connect to nerves, which send a signal to the brain, which interprets the vibrations as sound.
- This process will only work for sound waves with frequencies between 20 Hz and 20,000 Hz.

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