sound waves & hearing
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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. - PowerPoint PPT PresentationTRANSCRIPT
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
• 6.P .1.3Explain the relationship among the rate of vibration, the medium through which vibrations travel, sound and hearing.
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?
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?
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
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
Mechanical Waves
• Mechanical Waves are waves that require a solid, liquid or gas to move through
① Transversal Waves
② Longitudal Waves
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
How is Sound Created
① 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
Traveling through Mediums
• Sound waves are mechanical waves meaning they must travel through a medium (unlike Electromagnetic Waves)
• Solid• Liquid • Gas
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
Essential Questions
• Get with a partner and answer…
• How does sound travel through the mediums of solids, liquids, & gasses?
Particles Vibrating
② Next particles (atoms) crash into each other sending a chain reactions to the next particle & so on
• http://www.youtube.com/watch?v=ACeUO4ufx2I
Atoms/Energy Hits the Ear
③ The particles of atoms/energy crash into each other until they hit the human ear
④ The outer ear catches these atoms/energy and helps us determine…
Direction Frequency
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
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
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
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
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
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
How we Hear
• http://www.youtube.com/watch?v=_pcsOG-H3Ac
• 8:32-9:00
• http://www.youtube.com/watch?v=qgdqp-oPb1Q
Essential Questions
• Get with a partner and answer…
• How is the human ear designed to receive sound waves?