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Hearing and Sound

Science FUNdamentals

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OUTLINE

  • What is sound?
  • Hearing sounds
  • Harmful sounds

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What are sounds?

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Close your eyes and listen.

What do you hear?

These things that we hear are called sounds

What are Sounds?

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Sound can come in many forms Here are some examples of sounds

Music

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Noise

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Screaming

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  • SOUND is made up of waves
  • Loudness- how tall the wave is
  • Pitch - how frequent the wave is or how fast the source is vibrating

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What are Sounds?

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LET’S USE A SLINKY!

How can we change...

  • the Amplitude
  • the Pitch

Farrell, Lyle. “Wave Frequency GIF - Find & Share on GIPHY.” GIPHY, GIPHY, 13 Sept. 2019, giphy.com/gifs/retro-wave-CWb2IdPkVjaFO.

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Activity Time:

Mystery Sounds

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Credit: Chemistry Experiment Vector Illustration By Vecteezy

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Unknown Sounds

Match the sound effects to the source of the sound.

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Hearing Sounds

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How do our ears work?

  • Sound waves hit the eardrum and causes it to vibrate
  • Small bones (ossicles) vibrate and hits the cochlea
  • Fluid in the cochlea move hair (cilia)
  • Nerves sense hair movement and send signal to brain
  • Our ear also helps us with our balance!

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Sound in our ears

“Anatomy of the Ear.” Professional Hearing Services, Professional Hearing Services, www.heardakota.com/anatomy-of-the-ear/.

That sounded like a Car!

Cilia

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How the Eardrum works

Credit: Chemistry Experiment Vector Illustration By Vecteezy

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Pop Bottle Resonance

  • We will now see which of these bottles produce more high and low sounds

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Pop Bottle Resonance

Credit: Chemistry Experiment Vector Illustration By Vecteezy

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What Happened? Resonance!

  • Blowing air across the top → air particles move inside
  • A wave is created in the bottle → produces sound
  • Less water = more space for air = larger wave = lower sound (lower frequency)
  • Different bottles can produce different sounds

more water

less water

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What happened?

  • Your voice produced sound waves → changes in air pressure → plastic wrap vibrates → salt moves
  • Sound waves vibrate your eardrum (tympanic membrane) in the same way!

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TUNING FORKS

  • Each tuning fork produces a particular note, like a piano key
  • Sound waves travel by air, hitting the tuning fork close to the ear will make it sound different than hitting it far away

VIDEO LINK

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MARCO POLO

  • Sound reaches one ear before it reaches the other and our brain uses these small differences to locate the direction of a sound

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Harmful Sounds

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HARMFUL NOISES

  • What are some GOOD and BAD noises?
  • Listening to loud noises for long times can cause hearing damage

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QUESTIONS?

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