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Sound Notes

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Sound Notes What are sound waves? Sound waves are compressional waves. Like all waves, sound waves are caused by vibrations and carry energy. Sound waves can spread ... – PowerPoint PPT presentation

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Title: Sound Notes


1
Sound Notes
2
What are sound waves?
  • Sound waves are compressional waves.
  • Like all waves, sound waves are caused by
    vibrations and carry energy.
  • Sound waves can spread out in all directions.

3
Speed of sound
  • The speed of sound depends upon the medium in
    which it is traveling.
  • The speed of sound in air is about 347 m/s.
  • An increase in temp. of 10 degrees C equals about
    a 6 m/s increase in speed.

4
Liquids and Solids
  • Sound waves travel faster in liquids and solids
    than through gases.
  • Because the particles in liquids and solids are
    closer together so vibrations are transferred
    more rapidly.
  • However, some solids, like rubber, dampen
    vibrations and sound travels slowly.

5
Loudness and Intensity
  • The loudness of a sound depends partly on the
    energy contained in sound waves.
  • Loudness also depends on your distance from the
    source of the sound waves.
  • The intensity of a sound describes its loudness
    at a particular distance from the source of the
    sound.

6
Decibels
  • Relative intensity is measured in units called
    decibels, or dB.
  • A difference in intensity of 10 dB means a sound
    seems about twice as loud.

7
Pitch and Frequency
  • We know that high frequency equals high pitch and
    low frequency equals low pitch.
  • A high-pitched note is made by something
    vibrating very rapidly.
  • A low-pitched sound is made by something
    vibrating more slowly.

8
Infrasound and Ultrasound
  • Any sound with a frequency below the range of
    human hearing is known as infrasound.
  • Any sound with a frequency above human hearing
    range is known as ultrasound.
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