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- https://phys.libretexts.org/Bookshelves/College_Physics/College_Physics_1e_(OpenStax)/17%3A_Physics_of_Hearing/17.06%3A_HearingHearing is the perception of sound. (Perception is commonly defined to be awareness through the senses, a typically circular definition of higher-level processes in living organisms.) Normal human hea...Hearing is the perception of sound. (Perception is commonly defined to be awareness through the senses, a typically circular definition of higher-level processes in living organisms.) Normal human hearing encompasses frequencies from 20 to 20,000 Hz, an impressive range. Sounds below 20 Hz are called infrasound, whereas those above 20,000 Hz are ultrasound. Neither is perceived by the ear, although infrasound can sometimes be felt as vibrations.
- https://phys.libretexts.org/Bookshelves/University_Physics/University_Physics_(OpenStax)/Book%3A_University_Physics_I_-_Mechanics_Sound_Oscillations_and_Waves_(OpenStax)/17%3A_Sound/17.04%3A_Sound_IntensityIntensity is the same for a sound wave as was defined for all waves, where P is the power crossing area A. The SI unit for I is watts per meter squared. Sound intensity level in units of decibels (dB)...Intensity is the same for a sound wave as was defined for all waves, where P is the power crossing area A. The SI unit for I is watts per meter squared. Sound intensity level in units of decibels (dB) is equal to the logarithm of the ratio between the intensity heard and the threshold intensity for hearing. The perception of frequency is pitch. The perception of intensity is loudness and loudness has units of phons.
- https://phys.libretexts.org/Workbench/PH_245_Textbook_V2/16%3A_Sound/16.04%3A_Sound_IntensityIntensity is the same for a sound wave as was defined for all waves, where P is the power crossing area A. The SI unit for I is watts per meter squared. Sound intensity level in units of decibels (dB)...Intensity is the same for a sound wave as was defined for all waves, where P is the power crossing area A. The SI unit for I is watts per meter squared. Sound intensity level in units of decibels (dB) is equal to the logarithm of the ratio between the intensity heard and the threshold intensity for hearing. The perception of frequency is pitch. The perception of intensity is loudness and loudness has units of phons.
