Page 68 - Science Course 3 (Book 2)

Mo10-L3a: What are the Properties of Sound Waves?

The Outer Ear The Middle Ear The Inner Ear

The outer part of your ear Sound waves from the outer ear Sound waves in the inner ear
is shaped like a cup to collect hit against the eardrum, causing it travel through f uid-f lled chambers
sound waves. These waves move to vibrate. These vibrations move called the cochlea(KOH-Klee-uh).
through the ear canal to the end through the middle ear to tiny Tiny hairs in the cochlea vibrate
middle ear. bones that amplify the sound. and produce nerve signals that
travel to the brain. The brain
interprets these signals as sound.

Key Concept SUMMARY

What are the Properties of Sound Waves? What are the Properties of Sound Waves?

How do your ears enable you to hear sounds? Sounds are produced when an energy source
causes matter to vibrate.

Sound waves are compressions and
rarefactions that move away from a sound
source.

You hear sounds when your ears capture
sound waves and produce signals that travel
to your brain.

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