Page 75 - Science Course 3 (Book 2)

Mo10-L4b: How Do you Hear Sounds?

Mo10–L4b How Do you Hear Sounds?

The outer ear collects sound
KEY CONCEPTS: waves. The visible part of the
1. How do your ears enable you to hear sounds? outer ear funnels sound waves
into the ear canal.

Vocabulary A-Z

Let us learn some vocabulary
The middle ear includes a thin
membrane called the eardrum
pitch and three tiny bones which
amplify sound waves.
the perception of how high or low a sound is;
related to the frequency of a sound wave.

The inner ear consists of a
small, f uid-f lled chamber called
the cochlea that converts
vibrations to nerve signals that
travel to the brain.

echo
a ref ected sound wave. Key Concept
How Do you Hear Sounds?

Ref ection What is the function of each of the three parts of
the ear?

SOUND

Let’s Begin

The Human Ear

67