Did you hear that SOUND? - PowerPoint PPT Presentation

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Did you hear that SOUND?

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Did you hear that SOUND? Sound is a form of energy that travels in waves. What makes Sound? 1. Vibration: back and forth motion There can not be sound if there is not ... – PowerPoint PPT presentation

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Title: Did you hear that SOUND?


1
Did you hear that SOUND?
  • Sound is a form of energy
  • that travels in
  • waves.

2
What makes Sound?
  • 1. Vibration back and forth motion
  • There can not be sound if there is not any
    vibration
  • Most vibrations are too fast for you to see.
  • Vibrations require energysound is a form of
    energy.

3
How does Sound Travel?
  • 2. When something vibrates molecules in the air
    crowd together, then spread apart, causing sound
    waves to travel away from the vibrating object

4
What Forms of Matter can Sound Travel Through?
  • Gas sound travels easily through gases
  • It travels about 1,129 feet per second through
    air. (Thats how fast it travels when you talk!)
  • Liquids Sound travels through water about 4,794
    feet per second. (Think of what ripples look
    like in the water and how they spread.)
  • Solids Sound travels through a solid like wood
    at a rate of 12,620 feet per second. Sound
    travels fastest through solids!
  • Sound cannot travel through a vacuum (a space
    that is empty of matter).

5
Sound Reflection and Absorption
  • Reflected sound is called an echo.
  • 1. The vibrations are reflecting back to
    you.
  • Soft, air-filled objects absorb sound.
  • 1. When sound is absorbed, you do not
    hear it because it is not reflected back to
    you.

6
1. Sound Waves
  • Sound vibrations occur in waves that go out in
    every direction like a circle.
  • 1. Sound waves are created by repeated
    patterns of molecules spreading apart and
    squeezing together.

7
  • Sound Waves have 3 common features
  • 1. They
  • a. Have a set wavelength
  • b. Vibrate at different speeds
  • --Frequency the number of complete
    wavelengths, or times an object vibrates per
    second.
  • c. Carry Energy
  • --amplitude is the amount of energy a
    wave has
  • --high amplitude sound is made by
    objects with great vibrating motion

8
Pitch
  • 1. Pitch how high or low a sound is
  • The higher the pitch the more squeezed together
    the waves are
  • The higher the pitch the higher the frequency
  • The lower the pitch the lower the frequency

9
  • Making and Hearing Sounds
  • 1. Hearing Sound
  • a. Humans have two ears on opposite sides of
    their heads. Each ear gathers sound waves on
    each side of your body.
  • b. There are two ways that humans hear sounds.
  • With your ears.
  • With your brain.

10
How do you hear sound?
1. Sound causes your eardrum to vibrate. The
eardrum vibrates differently for each sound.
  • The bones of your ear begin to vibrate,
  • beginning with the hammer, moves to the anvil,
  • and finally the stirrup.
  • The sound energy passes to the inner ear.
  • This causes the fluid in the cochlea to move.
  • The nerves then carry the message to the
  • brain.

5. Your brain then tells you what the sound is.
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