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13.1 Sound

13.1 Sound. Chapter 13: Sound and Music. Human Ear. Label : -External Auditory Canal (label it “ear canal”) -Tympanic Membrane (label it “eardrum”) - Malleus (label it “inner ear bones”) -Cochlea You do not need to label anything else!. How do we hear?.

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13.1 Sound

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  1. 13.1 Sound Chapter 13: Sound and Music

  2. Human Ear Label: -External Auditory Canal (label it “ear canal”) -Tympanic Membrane (label it “eardrum”) -Malleus (label it “inner ear bones”) -Cochlea You do not need to label anything else!

  3. How do we hear? • We get our sense of hearing from the cochlea, a tiny fluid-filled organ in your inner ear • Inner ear has two important functions • Provide our sense of hearing • Provide our sense of balance

  4. How do we hear? • Eardrum vibrates in response to sound waves • The 3 delicate bones of the inner ear transmit vibrations to the cochlea • Fluid in the cochlea vibrates, sending waves that travel up the spiraled shape • Nerves near the beginning of the spiral response to longer wavelength (low frequency sounds) • Nerves at the end of the spiral respond to shorter wavelength (high frequency sounds)

  5. Range of Hearing • Human hearing: 20Hz – 20,000Hz • Animals can hear higher frequencies because they have more sensitive structures in their inner ear • People lose their range of frequencies as they age Mosquito ringtone • Tiny hairs shake when the fluid in the cochlea is vibrated • Listening to loud sounds can cause the hairs to break, and you will lose your hearing at a specific frequency

  6. Ultrasound • Ultrasound has a frequency MUCH higher than humans can hear (100,000Hz) • These waves can pass through the human body easily • Medical ultrasounds use refraction and reflection to create images Video

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