2.1

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2.1

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

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