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Sound Waves & Hearing

Sound Waves & Hearing. How do we Hear Sounds??. Essential Standard. 6.P.1Understand the properties of waves and the wavelike property of energy in earthquakes, light and sound waves. Clarifying Objective.

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Sound Waves & Hearing

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  1. Sound Waves & Hearing How do we Hear Sounds??

  2. Essential Standard • 6.P.1Understand the properties of waves and the wavelike property of energy in earthquakes, light and sound waves.

  3. Clarifying Objective • 6.P .1.3Explain the relationship among the rate of vibration, the medium through which vibrations travel, sound and hearing.

  4. Essential Questions • How does sound travel through the mediums of solids, liquids, & gasses? • How is the human ear designed to receive sound waves? • How do vocal chords work to produce sound?

  5. EOG Questions • What is the relationship between the speed of sound and the medium through which it passes? • If a guitar player adds thicker strings how will it effect the vibrations of the strings?

  6. Waves • Waves are a disturbance or vibration a way of transferring ENERGY from one place to another • They transport ENERGY from on place to another • There are different categories & types of waves • They all have their own characteristics that make them waves

  7. What is Sound • Sound is vibrations of energy that travel through a medium and can be heard and processed by human or animal ears • Vibrations • Travel through a medium • Solid • Liquid • Gas • Heard and processed by humans or animals • http://www.youtube.com/watch?v=czr7122MBOY

  8. Mechanical Waves • Mechanical Waves are waves that require a solid, liquid or gas to move through • Transversal Waves • Longitudal Waves

  9. Longitudinal Waves • Longitudinal Waves are like pinball waves. These waves vibrate in the direction of the flow of energy • An example is a pinball machine • http://www.youtube.com/watch?v=yd-G6KYwzvA • 2:48-3:47

  10. How is Sound Created • Sound Starts when an object is vibrated • The vibrations send out energy in a Longitudinal wave through a medium • The energy travels through either liquids, solids, or gases

  11. Traveling through Mediums • Sound waves are mechanical waves meaning they must travel through a medium (unlike Electromagnetic Waves) • Solid • Liquid • Gas

  12. Traveling Sound • Sound travels fastest through solids • It travels at a medium speed through liquids • Sound travels slowest through gases • http://www.youtube.com/watch?v=_pcsOG-H3Ac • 2:53-3:40

  13. Essential Questions • Get with a partner and answer… • How does sound travel through the mediums of solids, liquids, & gasses?

  14. Particles Vibrating • Next particles (atoms) crash into each other sending a chain reactions to the next particle & so on • http://www.youtube.com/watch?v=ACeUO4ufx2I

  15. Atoms/Energy Hits the Ear • The particles of atoms/energy crash into each other until they hit the human ear • The outer ear catches these atoms/energy and helps us determine… • Direction • Frequency

  16. Hitting the Ear Drum • The sound waves then travel down the ear canal and hit the ear drum • The ear drum begins to vibrate from the repeated atoms/energy hitting it

  17. Milieus • The vibrating ear drum then hits the first of three very small bones in the inner ear (smallest bones in the body) • This bone is called the Milieus which is attached to the ear drum • It is attached to the next bone and sends the vibration through

  18. Incus • The vibration then hits the Incus • The Incus is the middle bone in the inner ear • The Incus transfers the vibration of energy to the last of the 3 inner ear bones

  19. Stapes • The sound vibration is then sent to the last of the inner ear bones called the Stapes • The Stapes hits the side/wall of the cochlea and sends sound waves

  20. Cochlea • Inside the Cochlea there are about 20,000-30,000 little fibers that are kind of like blades of grass • These fibers are set to only recognize certain frequencies • When the specific frequency hits the specific fiber it sends a signal to tiny hair cells

  21. Cochlea • The tiny hair cells take the specific frequency to the Cochlear nerve • The Cochlear nerve then sends that frequency to the brain • The Brain identifies the sound and puts a name to the sound

  22. How we Hear • http://www.youtube.com/watch?v=_pcsOG-H3Ac • 8:32-9:00 • http://www.youtube.com/watch?v=qgdqp-oPb1Q

  23. Essential Questions • Get with a partner and answer… • How is the human ear designed to receive sound waves?

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