Properties Of Sound
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Properties Of Sound

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Properties Of Sound Presentation Transcript

  • 1. Properties of Sound
    Page 42
  • 2. Loudness
    Loudness is your perception of the energy that sound waves have
    Two key factors
    1. Amount of Energy
    Amplitude
    2. Distance from the source of sound
    Intensity = Energy per second
    43
  • 3. Intensity
    43
  • 4. Measuring Loudness
    Decibel (dB)
    44
  • 5. Human Pitch
    Vocal cords in larynx can vibrate 1,000 times/sec
    45
  • 6. Pitch
    Depends on the frequency of the wave
    High frequency = High pitch
    Measured in unit called hertz (Hz)
    80 Hz means 80 waves each second
    44
  • 7. Pitch
    Human Hearing
    20 Hz to 20,000 Hz
    Above 20,000 Hz can not hear – Ultrasound
    Below 20 Hz – Infrasound
    45
  • 8. The Doppler Effect
    The frequency of sound changes depending on where you are IF things are MOVING
    Described by Christian Doppler (1803-1853)
    The motion of the source adds to the motion of the waves
    46
  • 9. Sound Barrier
    Shock wave is formed by the piling up of sound waves
    People on the ground experience as sonic boom
    46
  • 10. Music
    What is the difference between music and noise?
    How the sound waves combine!
    Music is a pleasing combination of waves
    Noise is unpleasant combination of waves
    48
  • 11. Tones
    Fundamental Tone = Lowest natural frequency
    Overtone = Higher natural frequencies
    They are multiples of fundamental tone
    Instruments designed to resonate
    specific overtones
    49
  • 12. Stringed Instruments
    Loudness
    Resonance of strings to hollow body
    Pitch
    Length, thickness, material, tightness
    50
  • 13. Wind Instruments
    Loudness
    How much air is blown in
    Pitch
    Length of air column
    51
  • 14. Percussion Instruments
    Loudness
    How hard the strike
    Pitch
    Size, material, tension of drum head
    51
  • 15. Acoustics
    The study of how sounds interact with the environment
    Reverberation – repeated echoes
    Curved hard surfaces to direct sound
    Soft surfaces to absorb sound
    52