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FOR
TEACHERS
FOR
STUDENTS
FOR
REFERENCES
Level I
WHAT
SOUND IS THAT?
TRAVELING
SOUND
GOOD
VIBRATIONS
What
Sound Is That?
Background Information
The world we live in is full of
sounds. Some of these sounds are natural and some of them are
man made. Some of the sound are made intentionally, others accidentally.
Regardless of where they come from, many of these sounds send
us messages.
At school, a ringing bell tells
us to change class or to end class. A telephone ring lets us
know someone wants to talk to us. A glass falling on the floor
means, opps, a mess to clean up! Emergency sirens warn us. The
older we get we learn to recognize more and more sounds.
How
Does Sound Travel?
Sound waves travel through every
kind of material; the only place sound cannot travel is through
a vacuum because there is nothing to vibrate.
Solids, liquids, and gases are
all conductors of sound, but the speed of sound is different
for each type of material. Most sounds that we hear are transmitted
through air. sound waves travel much faster through solids and
liquids than through gases because the molecules are closer together.
Sample Speeds of Sound
Air
330 meters per second
1129 feet per second
Water
1500 meters per second
4794 feet per second
Wood
4500 meters per second
14850 feet per second
Metal
5000 meters per second
16500 feet per second
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What Sound Is That?
Background Information
The world we live in is full of sounds. Some of these sounds are natural and some of them are man made. Some of the sound are made intentionally, others accidentally. Regardless of where they come from, many of these sounds send us messages.
At school, a ringing bell tells us to change class or to end class. A telephone ring lets us know someone wants to talk to us. A glass falling on the floor means, opps, a mess to clean up! Emergency sirens warn us. The older we get we learn to recognize more and more sounds.
How Does Sound Travel?
Sound waves travel through every kind of material; the only place sound cannot travel is through a vacuum because there is nothing to vibrate.
Solids, liquids, and gases are all conductors of sound, but the speed of sound is different for each type of material. Most sounds that we hear are transmitted through air. sound waves travel much faster through solids and liquids than through gases because the molecules are closer together.
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