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Videos de Conceptos Relacionados

Perception of Sound Waves01:01

Perception of Sound Waves

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The human ear is not equally sensitive to all frequencies in the audible range. It may perceive sound waves with the same pressure but different frequencies as having different loudness. Moreover, the perception of sound waves depends on the health of an individual's ears, which decays with age. The health of one's ears may also be affected by regular exposure to loud noises.
The pitch of a sound depends on the frequency and the pressure amplitude of the source. Two sounds of the same...
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Speed of Sound in Solids and Liquids00:51

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Most solids and liquids are incompressible—their densities remain constant throughout. In the presence of an external force, the molecules tend to restore to their original positions, which is only possible because the constituents interact. The interactions help the constituents pass on information about external disturbances, like sound waves. Therefore, sound waves travel faster through these media. Compared to solids, the constituents in a liquid are less tightly bound. Thus, sound...
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Bewley Lattice Diagram01:12

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The Bewley lattice diagram, developed by L. V. Bewley, effectively organizes the reflections occurring during transmission-line transients. It visually represents how voltage waves propagate and reflect within a transmission line, making it easier to understand the complex interactions that occur.
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Echo01:06

Echo

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The human ear cannot distinguish between two sources of sound if they happen to reach within a specific time interval, typically 0.1 seconds apart. More than this, and they are perceived as separate sources.
Imagine the sound is reflected back to the ears. Assuming that the source is very close to the human, the difference between hearing the two sounds—the emitted sound and the reflected sound—may be more than the minimum time for perceiving distinct sounds. If this is the case,...
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Sound Waves: Interference00:53

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Sound waves can be modeled either as longitudinal waves, wherein the molecules of the medium oscillate around an equilibrium position, or as pressure waves. When two identical waves from the same source superimpose on each other, the combination of two crests or two troughs results in amplitude reinforcement known as constructive interference. If two identical waves, that are initially in phase, become out of phase because of different path lengths, the combination of crests with troughs...
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Standing Waves in a Cavity01:28

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A household microwave and lasers are examples of standing electromagnetic waves in a cavity. When two conducting metal plates are placed parallel at the nodal planes, it creates a cavity where standing waves are formed. The cavity between the two planes is analogous to a stretched string held at the points x = 0 and x = L. Here, the distance 'L' between the two planes must be an integer multiple of half of the wavelength. The wavelengths that satisfy this condition are given by:
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Trapping of Micro Particles in Nanoplasmonic Optical Lattice
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Una red óptica con sonido

Yudan Guo1,2, Ronen M Kroeze1,2, Brendan P Marsh2,3

  • 1Department of Physics, Stanford University, Stanford, CA, USA.

Nature
|November 11, 2021
PubMed
Resumen

Los investigadores crearon una red óptica con modos de fonones, lo que permite el estudio de las propiedades elásticas en los sólidos cuánticos. Este nuevo sistema permite explorar la fusión cuántica y los defectos exóticos.

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Área de la Ciencia:

  • La física cuántica
  • Física de la materia condensada
  • Física atómica

Sus antecedentes:

  • Los fonones (ondas sonoras cuantizadas) son cruciales para las propiedades de los materiales cristalinos.
  • Las redes ópticas tradicionales carecen de modos de fonones, lo que limita su capacidad para modelar sólidos reales.
  • Los simuladores cuánticos existentes no pueden replicar los comportamientos elásticos y termodinámicos gobernados por los fonones.

Objetivo del estudio:

  • Para diseñar una red óptica que exhibe modos de fonón.
  • Investigar la física de la elasticidad y las excitaciones colectivas en sólidos cuánticos.
  • Desarrollar un microscopio cuántico de gas para obtener imágenes y controlar los fonones.

Principales métodos:

  • Utilizó un condensado de Bose-Einstein acoplado a un resonador óptico confocal.
  • Empleado un sistema de electrodinámica cuántica de cavidad multimodo (QED).
  • Se han realizado mediciones de susceptibilidad dinámica para determinar las relaciones de dispersión de fonones.

Principales resultados:

  • Se ha creado con éxito una red óptica con modos fonónicos activos.
  • Relaciones de dispersión de fonones observadas con una velocidad de sonido ajustable por acoplamiento BEC-fotón.
  • Interacciones atomo-atomo mediadas por fotones que inducen la cristalización y los fonones de apoyo.

Conclusiones:

  • Este nuevo sistema de red óptica proporciona una plataforma para estudiar la elasticidad cuántica.
  • Los hallazgos abren vías para explorar las transiciones de fusión cuántica y los defectos fractónicos.
  • La capacidad del microscopio cuántico de gas permite una investigación detallada de la dinámica de los fonones.