How sound travels, pitch and volume. Also how the ear works.

1. How Does Sound Travel?
Created By: Ms. Ruszala

2. What is sound?
 Just like light, sound is a
type of energy.
 You can hear sound and
sometimes you can even feel
it.
 All sounds, from dogs
barking to children laughing,
are made when matter
vibrates, or moves quickly
back and forth.

3. Sound Waves
 Sound travels in
invisible waves.
 Unlike light waves,
sound waves must
travel through
matter.

4. Sound can travel through air,
water, or solid materials.

5. Sound Waves
 Sound waves, such as those
made by beating a drum,
vibrate the air around them.
 Then those vibrations move
through the air until they
reach your ear.

6. Volume
 Volume describes how loud or soft a sound is.
 Examples of loud sounds include a lion’s roar
or a jet landing.
 Examples of low-volume sounds include a
bird chirping or a breeze blowing through the
trees.

7. Pitch
 Pitch describes how low or
high a sound is.
 When matter vibrates
quickly, it produces a high
sound.
 When matter vibrates slowly,
it produces a low sound.
 Would you expect the flute
to play a sound with a low
pitch or a high pitch?

8. How do you hear sound?
 The sound waves hit the eardrum
and cause it to vibrate.
 The eardrum causes three tiny
bones to vibrate.
 When the tiny bones vibrate, they
cause a liquid inside the ear to
vibrate.
 The liquid carries the sound waves
to a nerve that carries a message
to the brain.
 Then you hear the sound.