Sound Energy
description
Transcript of Sound Energy
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Sound is a Form of Energy
• A table tennis ball hung in front of a speaker
• Ball will move as the sound waves hit it.
Sound wavesTable-tennis
ball
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Conversion of Sound Energy
• Sound causes our eardrums to vibrate.
• This is an example of sound energy being converted from one form of energy to another, mechanical energy. Both forms are kinetic energy.
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• Click on each box below to see how
- sound energy is converted to kinetic energy
- and to electrical energy
Conversion of Sound Energy
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• Sound energy is converted into electrical energy in a telephone.
• How?– The sound energy is converted to electrical
energy by a microphone. Then into radiant energy when it is sent to the other phone.
Conversion of Sound Energy
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• At the other end of the phone line
• The radiant energy is converted back to electrical energy which is converted back into sound energy.
Conversion of Sound Energy
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Sound Transmission• Transmission means sending from one
place to another.
• Sound waves are transmitted by particles in the air.
Air MoleculesSpeaker
Ear
Animation courtesy of Dr. Dan Russell, Kettering University
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Sound Transmission in Air
•Sound waves in air are passed between molecule
•What happens when you change frequency above?
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Sound does not Travel in a Vacuum
sound.jar
http://phet.colorado.edu/index.php
Click on the graphic above to start the simulation.
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• Sound travels at different speeds in different materials.
• In air..........................340 m/s
• In water.....................1500 m/s
• In steel.......................6000 m/s
The Speed of Sound
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• Which is faster, the speed of light or the speed of sound?
• How do you know?
The Speed of Sound
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• The speed of light is much faster!
• The speed of light........... 300,000,000 m/s
(approximately 186,282 miles per second )
• The speed of sound in air.... 340m/s
• (0.21 miles per second)
The Speed of Sound
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Light and Sound• Fireworks:
- you see the firework explode before you hear the bang.
• Waves on a beach: - you’ll see the waves break before you hear them
breaking.
• Lighting: - you see the lightning before you hear the thunder.
http://en.wikipedia.org/wiki/File:Lightnings_sequence_2_animation.gif