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  2. Sound particle - Wikipedia

    en.wikipedia.org/wiki/Sound_particle

    In the context of particle displacement and velocity, a sound particle is an imaginary infinitesimal volume of a medium that shares the movement of the medium in response to the presence of sound at a specified point or in a specified region. Sound particles are not molecules in the physical or chemical sense; they do not have defined physical ...

  3. Sound amplification by stimulated emission of radiation

    en.wikipedia.org/wiki/Sound_amplification_by...

    Sound (or lattice vibration) can be described by a phonon just as light can be considered as photons, and therefore one can state that SASER is the acoustic analogue of the laser. [citation needed] In a SASER device, a source (e.g., an electric field as a pump) produces sound waves (lattice vibrations, phonons) that travel through an active medium.

  4. Acoustic dispersion - Wikipedia

    en.wikipedia.org/wiki/Acoustic_dispersion

    In acoustics, acoustic dispersion is the phenomenon of a sound wave separating into its component frequencies as it passes through a material. The phase velocity of the sound wave is viewed as a function of frequency. Hence, separation of component frequencies is measured by the rate of change in phase velocities as the radiated waves pass ...

  5. Particle velocity - Wikipedia

    en.wikipedia.org/wiki/Particle_velocity

    Particle velocity should not be confused with the speed of the wave as it passes through the medium, i.e. in the case of a sound wave, particle velocity is not the same as the speed of sound. The wave moves relatively fast, while the particles oscillate around their original position with a relatively small particle velocity.

  6. List of particles - Wikipedia

    en.wikipedia.org/wiki/List_of_particles

    Elementary particles are particles with no measurable internal structure; that is, it is unknown whether they are composed of other particles. [1] They are the fundamental objects of quantum field theory. Many families and sub-families of elementary particles exist. Elementary particles are classified according to their spin.

  7. Absorption (acoustics) - Wikipedia

    en.wikipedia.org/wiki/Absorption_(acoustics)

    When sound from a loudspeaker collides with the walls of a room, part of the sound's energy is reflected back into the room, part is transmitted through the walls, and part is absorbed into the walls. Just as the acoustic energy was transmitted through the air as pressure differentials (or deformations), the acoustic energy travels through the ...

  8. Particle acceleration - Wikipedia

    en.wikipedia.org/wiki/Particle_acceleration

    In acoustics, particle acceleration is the acceleration (rate of change in speed and direction) of particles [clarification needed] in a sound transmission medium. When sound passes through a medium it causes particle displacement [1] and as such causes changes in their acceleration.

  9. Refraction (sound) - Wikipedia

    en.wikipedia.org/wiki/Refraction_(sound)

    Refraction, in acoustics, comparable to the refraction of electromagnetic radiation, is the bending of sound propagation trajectories (rays) in inhomogeneous elastic media (gases, liquids, and solids) in which the wave velocity is a function of spatial coordinates. Bending of acoustic rays in layered inhomogeneous media occurs towards a layer ...