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2.1 2.1 Presentation Transcript

  • Sound is a Wave Pages 37-43 (section C)
  • Sound is a Type of Mechanical Wave
    • Sound - a wave that is produced by a vibrating object and travels through matter
    • Vibration - a rapid, back and forth motion
  • How Sound Waves are Produced in the Human Body
    • Your muscles push air up from you lungs and through the narrow opening between the vocal cords.
    • The force of the air causes the vocal cords to vibrate.
    • The vibrating vocal cords produce sound waves
    1 2 3
  • How Sound Waves are Detected by the Human Body
    • Outer ear collects sound waves and reflects them into the ear canal.
    • The ear drum ( at the end of the ear canal) vibrates
    • The middle ear contains 3 tiny, connected bones (hammer, anvil stirrup) The bones carry vibrations to the inner ear.
    • The cochlea sends the vibrations to the brain
  • Cochlea
    • The cochlea has about 30,000 hair cells.
    • These hairs can be easily damaged, causing hearing loss.
  • Sound Waves Vibrate Particles
    • Sound waves travel by compression.
    • The particles in the medium (usually the air) are compressed and transfer the energy as sound.
  • Sound Waves are Mechanical Waves
    • Since sound waves are mechanical waves they require a medium to travel through.
    • A vacuum is empty space. Sound can not travel in a vacuum.
  • Speed of Sound
    • Sound travels more slowly than light.
    • Sound does not always travel at the same speed.
    • Sound travels faster in liquids than in gases.
    • Sound travels faster in higher temperatures than lower temperatures.
  • http:// www.youtube.com/watch?v =CSO765hyxrc&feature=related