2.1

2.1

• 1.
  Sound is aWave Pages 37-43 (section C)
• 2.
  Sound is aType of Mechanical Wave Sound - a wave that is produced by a vibrating object and travels through matter Vibration - a rapid, back and forth motion
• 3.
  How Sound Wavesare 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
• 4.
  How Sound Wavesare 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
• 5.
  Cochlea The cochleahas about 30,000 hair cells. These hairs can be easily damaged, causing hearing loss.
• 6.
  Sound Waves VibrateParticles Sound waves travel by compression. The particles in the medium (usually the air) are compressed and transfer the energy as sound.
• 7.
  Sound Waves areMechanical 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.
• 8.
  Speed of SoundSound 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.
• 9.
  http:// www.youtube.com/watch?v =CSO765hyxrc&feature=related