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  2. Sonic weapon - Wikipedia

    en.wikipedia.org/wiki/Sonic_weapon

    Sonic and ultrasonic weapons (USW) are weapons of various types that use sound to injure or incapacitate an opponent. Some sonic weapons make a focused beam of sound or of ultrasound; others produce an area field of sound. As of 2023 military and police forces make some limited use of sonic weapons.

  3. Sonochemistry - Wikipedia

    en.wikipedia.org/wiki/Sonochemistry

    [13] [14] [5] The chemical enhancement of reactions by ultrasound has been explored and has beneficial applications in mixed phase synthesis, materials chemistry, and biomedical uses. Because cavitation can only occur in liquids, chemical reactions are not seen in the ultrasonic irradiation of solids or solid–gas systems.

  4. Sonication - Wikipedia

    en.wikipedia.org/wiki/Sonication

    Sonication has numerous effects, both chemical and physical. The scientific field concerned with understanding the effect of sonic waves on chemical systems is called sonochemistry. The chemical effects of ultrasound do not come from a direct interaction with molecular species.

  5. Electroacoustic phenomena - Wikipedia

    en.wikipedia.org/wiki/Electroacoustic_phenomena

    Colloid vibration current (CVI) and potential, an electric signal that arises when ultrasound propagates through a heterogeneous fluid, such as a dispersion or emulsion. Electric sonic amplitude (ESA), the inverse of the CVI effect, in which an acoustic field arises when an electric field propagates through a heterogeneous fluid.

  6. Ultrasound - Wikipedia

    en.wikipedia.org/wiki/Ultrasound

    Ultrasound is sound with frequencies greater than 20 kilohertz. [1] This frequency is the approximate upper audible limit of human hearing in healthy young adults. The physical principles of acoustic waves apply to any frequency range, including ultrasound. Ultrasonic devices operate with frequencies from 20 kHz up to several gigahertz.

  7. Ultrasonic hearing - Wikipedia

    en.wikipedia.org/wiki/Ultrasonic_hearing

    Ultrasonic hearing is a recognised auditory effect which allows humans to perceive sounds of a much higher frequency than would ordinarily be audible using the inner ear, usually by stimulation of the base of the cochlea through bone conduction. Normal human hearing is recognised as having an upper bound of 15–28 kHz, [1] depending on the person.

  8. Hypersonic effect - Wikipedia

    en.wikipedia.org/wiki/Hypersonic_effect

    The hypersonic effect is a phenomenon reported in a controversial scientific ... No effect was detected on listeners in the Oohashi study when only the ultrasonic ...

  9. Sound from ultrasound - Wikipedia

    en.wikipedia.org/wiki/Sound_from_ultrasound

    Sound from ultrasound is the name given here to the generation of audible sound from modulated ultrasound without using an active receiver. This happens when the modulated ultrasound passes through a nonlinear medium which acts, intentionally or unintentionally, as a demodulator .