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  2. Auroral chorus - Wikipedia

    en.wikipedia.org/wiki/Auroral_chorus

    An auroral chorus is a series of electromagnetic waves at frequencies which resemble chirps, whistles, and quasi-musical sounds in predominantly rising tones when played as pressure waves (sound), which are created by geomagnetic storms also responsible for the auroras. The sounds last approximately 0.1 to 1.0 seconds.

  3. Wikipedia:Free sound resources - Wikipedia

    en.wikipedia.org/wiki/Wikipedia:Free_sound_resources

    Independent, unique sound library with royalty free & free sound effects - for video, sound design, music productions and more. CC0, CC BY Gfx Sounds: Yes Yes Sound library for professional and free sound effects downloads. CC0, CC BY Free To Use Sounds: Yes Yes Sound effects library with hiqh quality field recordings from all around the world.

  4. Sound - Wikipedia

    en.wikipedia.org/wiki/Sound

    The sound waves are generated by a sound source, such as the vibrating diaphragm of a stereo speaker. The sound source creates vibrations in the surrounding medium. As the source continues to vibrate the medium, the vibrations propagate away from the source at the speed of sound, thus forming the sound wave.

  5. Acoustic wave - Wikipedia

    en.wikipedia.org/wiki/Acoustic_wave

    An acoustic wave is a mechanical wave that transmits energy through the movements of atoms and molecules. Acoustic waves transmit through fluids in a longitudinal manner (movement of particles are parallel to the direction of propagation of the wave); in contrast to electromagnetic waves that transmit in transverse manner (movement of particles at a right angle to the direction of propagation ...

  6. Acoustic levitation - Wikipedia

    en.wikipedia.org/wiki/Acoustic_levitation

    Typically sound waves at ultrasonic frequencies are used [4] thus creating no sound audible to humans. This is primarily due to the high intensity of sound required to counteract gravity. However, there have been cases of audible frequencies being used. [5] A Langevin horn type standing wave acoustic levitator at the Argonne National Laboratory

  7. 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.

  8. Cosmic noise - Wikipedia

    en.wikipedia.org/wiki/Cosmic_noise

    Cosmic noise, also known as galactic radio noise, is a physical phenomenon derived from outside of the Earth's atmosphere.It is not actually sound, and it can be detected through a radio receiver, which is an electronic device that receives radio waves and converts the information given by them to an audible form.

  9. Acoustic location - Wikipedia

    en.wikipedia.org/wiki/Acoustic_location

    Swedish soldiers operating an acoustic locator in 1940. Acoustic location is a method of determining the position of an object or sound source by using sound waves. Location can take place in gases (such as the atmosphere), liquids (such as water), and in solids (such as in the earth).

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