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  • sound
    • a form of energy
    • longitudinal wave
    • produced by vibrating medium
      • push or pull on adjacent air
        • causes small, rapid changes in the air pressure
      • cannot be produced in vacuum
    • pushing of air molecules are compressions and the layer of air has high pressure
    • pulling of air molecules are rarefactions and the layer of air has low pressure
    • factors
      • temperature
      • humidity
      • density of media
    • speed of sound
      • v=d/t
    • echo
      • reflected sound waves off hard surfaces
    • greater amplitude, louder sound
    • higher frequency, higher pitch, waves closer together
    • humans:20Hz-20000Hz


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