How Sound Travels

1
How Sound Travels
Sound travels in the shape of waves which move
out in all directions from the source of the
sound.
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2
Sound Travels in All Directions
Just like when you throw a stone in a pond and
the waves go out all around where the stone went
into the water, so sound travels in all
directions from its source.
3
Sound Pushes the Air
When you hit a drum the air next to the drum gets
pushed tightly together. When the air relaxes,
it pushes the air next to it and so on.
4
The Sound Reaches Your Ear
The sound keeps pushing the air all the way to
your ear where it pushes against your eardrum and
you hear the sound.
5
High and Low Sound Waves
When the sound waves are closer together, the
sound is higher. When the sound waves are
further apart the sound is lower.
6
Loud and Soft Sound Waves
When the waves are tall the sound is loud!
When the waves are short the sound is soft.
7
Listen to the different sounds
8
Columns of Air
When the air in a container gets shorter, the
sound gets higher. What happens when the air gets
longer?
high
low
9
Strings

Long strings make low sounds. What kind of sound
will a short string make?