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- https://phys.libretexts.org/Courses/Joliet_Junior_College/JJC_-_PHYS_110/05%3A_Book-_Physics_(Boundless)/5.08%3A_Waves_and_Vibrations/5.8.06%3A_Wave_Behavior_and_InteractionWhen the medium changes, a wave often experiences partial transmission and partial refection at the interface.
- 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/College_Physics/College_Physics_1e_(OpenStax)/17%3A_Physics_of_Hearing/17.07%3A_UltrasoundAny sound with a frequency above 20,000 Hz (or 20 kHz)—that is, above the highest audible frequency—is defined to be ultrasound. In practice, it is possible to create ultrasound frequencies up to more...Any sound with a frequency above 20,000 Hz (or 20 kHz)—that is, above the highest audible frequency—is defined to be ultrasound. In practice, it is possible to create ultrasound frequencies up to more than a gigahertz. (Higher frequencies are difficult to create; furthermore, they propagate poorly because they are very strongly absorbed.) Ultrasound has a tremendous number of applications, which range from burglar alarms to use in cleaning delicate objects to the guidance systems of bats.
- https://phys.libretexts.org/Courses/Prince_Georges_Community_College/PHY_2040%3A_General_Physics_III/01%3A_Waves_and_Vibrations/1.6%3A_Wave_Behavior_and_InteractionWhen the medium changes, a wave often experiences partial transmission and partial refection at the interface.
- https://phys.libretexts.org/Bookshelves/University_Physics/Physics_(Boundless)/15%3A_Waves_and_Vibrations/15.6%3A_Wave_Behavior_and_InteractionWhen the medium changes, a wave often experiences partial transmission and partial refection at the interface.
- https://phys.libretexts.org/Courses/Coalinga_College/Physical_Science_for_Educators_(CID%3A_PHYS_14)/14%3A_Property_of_Sound_Doppler_Effect_and_Interferences/14.08%3A_UltrasoundThe distance to underwater objects can be calculated from the known speed of sound in water and the time it takes for the sound waves to travel to the object. If an ultrasound wave travels from the sh...The distance to underwater objects can be calculated from the known speed of sound in water and the time it takes for the sound waves to travel to the object. If an ultrasound wave travels from the ship to the submarine and back again in 2 seconds, what is the distance from the ship to the submarine? The sound wave travels from the ship to the submarine in just 1 second, or half the time it takes to make the round trip.
