5th grade chapter 14 section 2 - what is sound energy
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5th grade chapter 14 section 2 - what is sound energy

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5th grade chapter 14 section 2 - what is sound energy Presentation Transcript

  • 1. CHAPTER 14 SECTION 2
  • 2. SOUND–a wave of vibrations that spreads fromits source.• Vibration is the back-and-forth motion ofan object.
  • 3. Crest - areas where particles are veryclose togetherFrequency - The number of crests thatpass by a point each secondThe greater the frequency is, the higherthe pitch of the sound
  • 4. Why Are Some Sounds LouderThan Others?• The source of the louder soundsis vibrating more.• These sound waves have moreenergy.• A sound’s loudness can bemeasured in units calleddecibels.
  • 5. YOUR VOICE• Your vocal cords vibrate when you talk.• The vibrations are caused by air rushing pastthem.• Your vocal cords make the particles in the airaround them vibrate.• These vibrations travel outward through theair as sound waves.
  • 6. How Does Sound Behave?• Sound can travel through solids,liquids, and gases• It cannot travel through a vacuum,which is empty space that contains noparticles• The speed at which sound wavestravel is different in differentmaterials.
  • 7. Sound Transfers Energy• For a sound to be heard, energy must first causeanobject to vibrate.• Vibrating objects give off energy in sound waves inair.• Some of the energy reaches your ear, and youreardrum absorbs some of the energy.• In this way, the energyof the original material’svibrations passes to you.
  • 8. SOUND–a wave of vibrations that spreads fromits source.• Vibration is the back-and-forth motion ofan object.
  • 9. Crest - areas where particles are veryclose togetherFrequency - The number of crests thatpass by a point each secondThe greater the frequency is, the higherthe pitch of the sound
  • 10. Why Are Some Sounds LouderThan Others?• The source of the louder soundsis vibrating more.• These sound waves have moreenergy.• A sound’s loudness can bemeasured in units calleddecibels.
  • 11. YOUR VOICE• Your vocal cords vibrate when you talk.• The vibrations are caused by air rushing pastthem.• Your vocal cords make the particles in the airaround them vibrate.• These vibrations travel outward through theair as sound waves.
  • 12. How Does Sound Behave?• Sound can travel through solids,liquids, and gases• It cannot travel through a vacuum,which is empty space that contains noparticles• The speed at which sound wavestravel is different in differentmaterials.
  • 13. Sound Transfers Energy• For a sound to be heard, energy must first causeanobject to vibrate.• Vibrating objects give off energy in sound waves inair.• Some of the energy reaches your ear, and youreardrum absorbs some of the energy.• In this way, the energyof the original material’svibrations passes to you.