Sound. Sound Waves. The origin of any sound is a vibrating object Usually the frequency of the sound is the same as that of the vibrating object Frequency Range: Sound: 20 Hz – 20,000 Hz Ultrasound: >20,000 Hz Infrasound: < 20 Hz. Forced Vibration & Resonance.
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Sound: 20 Hz – 20,000 Hz
Ultrasound: >20,000 Hz
Infrasound: < 20 Hz
Double frequency – go up an octave
Decibel Scale is logarithmic