Sound Energy

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Sound Energy!

• A Virtual Study guide.

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Energy has the ability to change matter!
What is energy?
Energy moves in waves!
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Sound Energy

• Is the ability of sound to make matter vibrate.
• Sound can change matter.
• Sound is energy!

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Sound Energy Moves In
WAVES!

• These waves represent energy moving.
• An oscilloscope is a device that helps us to see
  these waves.
• Energy waves have amplitude, wavelength, and
  frequency.

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The Sound Wave
Wavelength
Amplitude
(Vibrations per second)
Frequency
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What is wavelength?

• Wavelength is the distance between a point on one
  wave to the same point on the next wave.

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AMPLITUDE!

• The height of a sound wave shows the amplitude.
• The amplitude of the sound wave shows us how loud
  the volume of a sound is.

Low amplitude
Low volume (soft sounds)
High amplitude
High volume (loud sounds)
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Frequency

• The amount of times a sound makes matter vibrate
  in one second is called the frequency.
• The higher the frequency the higher the pitch of
  the sound.
• The lower the frequency the lower the pitch.

High Frequency
Low Frequency
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Decibels
The unit of measurement when we measure sound.

• The human ear should not be exposed to sounds of
  85 decibels or more over an extended period of
  time.
• Any sounds over 150 decibels could instantly
  cause permanent hearing damage.

• The average speaking voice is about 60 decibels.
• A person whispers at about 20 decibels.
• A telephone rings at about 70 decibels.

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When energy comes in contact with matter, any of
these three things could happen.
Absorbed
Reflection
Passes through
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How sound moves through matter.

• Sound moves fastest through solids.
• The harder the solid the faster the sound moves.
• Sound travels through liquids faster than it does
  through gasses, but slower than it does through
  solids.
• Sound travels slowest through gasses.

Put one ear on a solid and leave one ear in the
air. Notice how sound travels faster through a
solid.
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The End!

• Remember to study your notes!
• Re-read pages D6-D22.