sound waves

• humans can only hear 20hz to 20khz
• travels faster in solids than in liquids

  by causing particles to vibrate, hit each other and pass sound wave through object
• human hearing is limited due to shape of ear drum
• in denser material = speeds up

  longitudinal
• ear drum

  • sound waves causes ear drums to vibrate
  • these vibrations passes onto ossicles ( tiny bones ) and to the cochlea
  • cochlea turns vibrations into electrical signals that are sent to the brain to be understood as sounds