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Lesson 5
How do scientists use what they know about sound?
Lesson 5
How do scientists use what they know about sound?
Scientists have worked out how the ear works.
[1] Soundwaves enter the ear canal.
[2] They travel to the eardrum and make it vibrate.
[3] The vibrations make three small bones behind the eardrum vibrate too.
[4] The vibrations travel into the inner ear to a part called the cochlea.
Fluid in the cochlea moves. The fluid makes tiny hairs move. The hairs change the movement into signals or messages.
[5] The hearing nerve takes the messages to the brain. The brain works out what the sound is.
Some people cannot hear well.
Scientists have invented hearing aids to help them.
Hearing aids are simple machines.
Most work using batteries.
They pick up sound and make it louder.
They send the loud sound into the ear.
The sounds are sent to the brain.
I wonder how scientists help people who cannot see?
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