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Sound waves

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  • 1. Sound WavesMay 14, 2013
  • 2. Objectives1. Understand that a sound wave is acompressional wave2. Label compression, rarefaction, wavelength,and amplitude3. Recognize how sound moves and therelated terms, loudness, pitch, frequency,and acoustics
  • 3. The Nature of Waves What is a wave? A wave is a repeating disturbance ormovement that transfers energythrough matter or space
  • 4. Waves transfer energy not matter.Waves below are carrying energy but are not moving.Can only exist as they have energy to carry.
  • 5. What are mechanical waves? Mechanical waves are waves which require amedium. A medium is a form of matter through whichthe wave travels (such as water, air, glass,etc.) Waves such as light, x-rays, and other formsof radiation do not require a medium.
  • 6. • Compressional WavesIn a longitudinal wave the matter in the wave movesback and forth parallel to the direction of the wave
  • 7. Sound Waves are compressional waves. Sound travels as vibrations moving throughthe air as a compressional wave. Sound travels through air, but travels throughother materials as well. Whale communicate through long distancesby producing sounds under water.
  • 8. What are Seismic Waves? An energy wave which vibrates through theearth’s crust as the crust bends or breaks. Seismic waves are exist as both transverseand compressional waves. Some travel through the earth and sometravel across the earth’s surface.
  • 9. Anatomy of a Seismic Wave
  • 10. CompressionalLongitudinal wavearea squeezed together iscalled the compression.The areas spread out arecalled the rarefaction.The wavelength is thedistance from the center ofone compression to thecenter of the nextcompression.
  • 11. What is sound?Sound is a compressional wave which travels throughthe air through a series of compressions andrarefactions.
  • 12. Sound travels through different media. We hear sound which usuallytravels through air. Sound travels through othermedia Sound travels different speedsin different media. Sound travels faster in a solid thata liquid faster in a liquid than a gas.
  • 13.  The denser the medium, the faster sound willtravel. The higher the temperature, the faster theparticles of the medium will move and thefaster the particles will carry the sound.
  • 14. What is sound intensity? Sound intensity - energy that the sound wavepossesses. greater the intensity of sound the farther thesound will travel louder the sound will appear. Loudness is very closely related to intensity.Loudness is the human perception of the soundintensity. decibels.
  • 15. Loudness in Decibels
  • 16. How is frequency related to pitch? The pitch of a sound wave is directly relatedto frequency. A high-pitched sound has a high frequency (ascreaming girl). A low-pitched sound has a low frequency (afog-horn).
  • 17.  A healthy human ear can hear frequencies in therange of 20 Hz to 20,000 Hz. Humans cannot hear below 20 Hz. Soundsbelow this frequency are termed infrasonic. Sounds above 20,000 Hz are termedultrasonic. Some animals, such as dogs, can hearfrequencies in this range in which humans cannothear.
  • 18. Using SoundWhat is Acoustics?Acoustics is the study of sound and ways to optimizethe hearing of sound inside various structures.

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