25 points 1. auditory range
frequencies above the human auditory range
2. decibel
a perception of sound that relates to the amplitude of the sound wave
3. infrasound
the highness or lowness of a sound, measured in hertz
4. loudness
the range of frequencies humans can hear
5. pitch
frequencies below the human auditory range
6. ultrasound
a unit for measuring the perception of sound loudness