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Sound Waves. Sound Waves. mechanical, longitudinal waves require a medium may pass through solids, liquids, or gases medium particles move parallel to the motion of the wave has compressions and rarefactions. Speed of Sound. about 342 m/s in air changes with temperature

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Presentation Transcript
sound waves1
Sound Waves
  • mechanical, longitudinal waves
    • require a medium
      • may pass through solids, liquids, or gases
    • medium particles move parallel to the motion of the wave
    • has compressions and rarefactions
speed of sound
Speed of Sound
  • about 342 m/s in air
    • changes with temperature
  • much slower than light
    • speed of light = 300,000,000 m/s
loudness or intensity
Loudness or Intensity
  • Sound Simulator
  • amplitude (energy) of a wave
  • describes how loud or soft a sound is
  • measured in decibels
loudness or intensity1
Loudness or Intensity
  • Soft
    • Low energy
  • Loud
    • High energy
pitch
Pitch
  • Sound Simulator
  • frequency of a wave
    • measured in Hertz
  • how high or low a sound is
pitch1
Pitch
  • Low f, low pitch
    • Large wavelength
  • High f, high pitch
    • Small wavelength
pitch human hearing
Pitch & Human Hearing
  • Humans hear between 20-20,000 Hz
    • Ultrasound – too high f for humans to hear
    • Infrasound – too low f for humans to hear
doppler effect1
Doppler Effect
  • as a sound producing object approaches a receiver (listener) the sound’s pitch increases (high f)
    • the waves appear to sound higher
doppler effect2
Doppler Effect
  • as the object moves away, the pitch drops (low f)
    • the sounds appears to sound lower
doppler effect3
Doppler Effect
  • occurs for other types of waves as well, but is easiest to relate to sound waves
doppler effect4
Doppler Effect
  • Used to:
    • Predict weather
    • Tell instant speed of moving objects
    • Track galaxies
slide15
1999

Oklahoma City

F 5 Tornado

St. Nazianz storm May 12, 2000. Caused some schools to be extended.

acoustics
Acoustics
  • How sound interacts with surroundings
slide17
Refraction

Reflection

  • Why does sound travel a long distance over water?
  • Sound waves bounce off the flat surface of a lake
  • Sound waves refract off of warm air over a lake

Warm Air

Cool Air

room and building acoustics
Room and Building Acoustics
  • Sound behavior in a room depends on many factors:
    • Volume
    • Shape of room
    • Echo patterns
room and building acoustics3
Room and Building Acoustics
  • Construction Material
    • Energy absorbing: foam, wood, carpet
    • Energy reflecting: metal, concrete
room and building acoustics4
Room and Building Acoustics
  • Audience layout
  • Furnishing
  • Source of Sound
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