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  2. Wave speed - Wikipedia

    en.wikipedia.org/wiki/Wave_speed

    Wave speed is a wave property, which may refer to absolute value of: . phase velocity, the velocity at which a wave phase propagates at a certain frequency; group velocity, the propagation velocity for the envelope of wave groups and often of wave energy, different from the phase velocity for dispersive waves

  3. Soliton - Wikipedia

    en.wikipedia.org/wiki/Soliton

    Solitary wave in a laboratory wave channel. In mathematics and physics, a soliton is a nonlinear, self-reinforcing, localized wave packet that is strongly stable, in that it preserves its shape while propagating freely, at constant velocity, and recovers it even after collisions with other such localized wave packets.

  4. Total internal reflection - Wikipedia

    en.wikipedia.org/wiki/Total_internal_reflection

    Fig. 1: Underwater plants in a fish tank, and their inverted images (top) formed by total internal reflection in the water–air surface. In physics, total internal reflection (TIR) is the phenomenon in which waves arriving at the interface (boundary) from one medium to another (e.g., from water to air) are not refracted into the second ("external") medium, but completely reflected back into ...

  5. Rayleigh wave - Wikipedia

    en.wikipedia.org/wiki/Rayleigh_wave

    Rayleigh waves are distinct from other types of surface or guided acoustic waves such as Love waves or Lamb waves, both being types of guided waves supported by a layer, or longitudinal and shear waves, that travel in the bulk. Rayleigh waves have a speed slightly less than shear waves by a factor dependent on the elastic constants of the ...

  6. Biological illustration - Wikipedia

    en.wikipedia.org/wiki/Biological_illustration

    For example, in the Chauvet-Pont-d'Arc Cave (circa 30,000 BC), at least 13 different species have been identified. [2] In one prehistoric cave (circa 15,000 BC), there is a drawing of a mammoth with a darkened area where the heart should be. If this is indeed the intention of the illustration, it would be the world's first anatomical ...

  7. Speeds of sound of the elements - Wikipedia

    en.wikipedia.org/wiki/Speeds_of_sound_of_the...

    The speed of sound in any chemical element in the fluid phase has one temperature-dependent value. In the solid phase , different types of sound wave may be propagated, each with its own speed: among these types of wave are longitudinal (as in fluids), transversal , and (along a surface or plate) extensional .

  8. Surface plasmon resonance - Wikipedia

    en.wikipedia.org/wiki/Surface_plasmon_resonance

    Surface plasmon resonance (SPR) is a phenomenon that occurs where electrons in a thin metal sheet become excited by light that is directed to the sheet with a particular angle of incidence, and then travel parallel to the sheet. Assuming a constant light source wavelength and that the metal sheet is thin, the angle of incidence that triggers ...

  9. 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 ...

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