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Related Concept Videos

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.
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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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Echo01:06

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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.
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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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Related Experiment Video

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Trapping of Micro Particles in Nanoplasmonic Optical Lattice
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Trapping of Micro Particles in Nanoplasmonic Optical Lattice

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An optical lattice with sound.

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

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

Nature
|November 11, 2021
PubMed
Summary
This summary is machine-generated.

Researchers created an optical lattice with phonon modes, enabling the study of elastic properties in quantum solids. This new system allows for exploring quantum melting and exotic defects.

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Area of Science:

  • Quantum physics
  • Condensed matter physics
  • Atomic physics

Background:

  • Phonons (quantized sound waves) are crucial for crystalline material properties.
  • Traditional optical lattices lack phonon modes, limiting their ability to model real solids.
  • Existing quantum simulators cannot replicate the elastic and thermodynamic behaviors governed by phonons.

Purpose of the Study:

  • To engineer an optical lattice that exhibits phonon modes.
  • To investigate the physics of elasticity and collective excitations in quantum solids.
  • To develop a quantum gas microscope for imaging and controlling phonons.

Main Methods:

  • Utilized a Bose-Einstein condensate coupled to a confocal optical resonator.
  • Employed a multimode cavity quantum electrodynamics (QED) system.
  • Performed dynamical susceptibility measurements to determine phonon dispersion relations.

Main Results:

  • Successfully created an optical lattice with active phonon modes.
  • Observed phonon dispersion relations with a sound speed tunable by BEC-photon coupling.
  • Demonstrated photon-mediated atom-atom interactions inducing crystallization and supporting phonons.

Conclusions:

  • This novel optical lattice system provides a platform for studying quantum elasticity.
  • The findings open avenues for exploring quantum melting transitions and fractonic defects.
  • The quantum gas microscope capability allows for detailed investigation of phonon dynamics.