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関連する概念動画

Shock Waves01:16

Shock Waves

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While deriving the Doppler formula for the observed frequency of a sound wave, it is assumed that the speed of sound in the medium is greater than the source's speed through it. When this condition is breached, a shock wave occurs.
When the source's speed approaches the speed of sound, constructive interference between successive wavefronts emitted by the source occurs immediately behind it. Initially, scientists believed that this constructive interference would result in such high...
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Speed of Sound in Solids and Liquids00:51

Speed of Sound in Solids and Liquids

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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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Deriving the Speed of Sound in a Liquid01:09

Deriving the Speed of Sound in a Liquid

648
As with waves on a string, the speed of sound or a mechanical wave in a fluid depends on the fluid's elastic modulus and inertia. The two relevant physical quantities are the bulk modulus and the density of the material. Indeed, it turns out that the relationship between speed and the bulk modulus and density in fluids is the same as that between the speed and the Young's modulus and density in solids.
The speed of sound in fluids can be derived by considering a mechanical wave...
648
Sound Waves: Interference00:53

Sound Waves: Interference

4.0K
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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The Quantum-Mechanical Model of an Atom02:45

The Quantum-Mechanical Model of an Atom

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Shortly after de Broglie published his ideas that the electron in a hydrogen atom could be better thought of as being a circular standing wave instead of a particle moving in quantized circular orbits, Erwin Schrödinger extended de Broglie’s work by deriving what is now known as the Schrödinger equation. When Schrödinger applied his equation to hydrogen-like atoms, he was able to reproduce Bohr’s expression for the energy and, thus, the Rydberg formula governing hydrogen spectra.
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Speed of Sound in Gases01:08

Speed of Sound in Gases

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The speed of sound in a gaseous medium depends on various factors. Since gases constitute molecules that are free to move, they are highly compressible. Hence, sound waves travel slowly through gases. Thermodynamics helps us understand the relationship between pressure, volume, and temperature of gases, thus, the speed of sound in an ideal gas can be determined using the laws of thermodynamics. At the same time, Newton's laws of motion and the continuity equation of fluid dynamics also come...
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関連する実験動画

Updated: Oct 4, 2025

Scalable Quantum Integrated Circuits on Superconducting Two-Dimensional Electron Gas Platform
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Scalable Quantum Integrated Circuits on Superconducting Two-Dimensional Electron Gas Platform

Published on: August 2, 2019

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第2の音の弱化は,量子的批判性に近い.

Xi Li1,2,3, Xiang Luo1,2,3, Shuai Wang1,2,3

  • 1Hefei National Laboratory for Physical Sciences at the Microscale and Department of Modern Physics, University of Science and Technology of China, Hefei 230026, China.

Science (New York, N.Y.)
|February 3, 2022
PubMed
まとめ

研究者はリチウム6原子の均質なフェルミガスで 2度目の音の減衰を観測した. この発見は超流動性や 量子批判性に近い 重要な現象を理解するために 極めて重要です

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Gradient Echo Quantum Memory in Warm Atomic Vapor

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Measurement of Quantum Interference in a Silicon Ring Resonator Photon Source
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科学分野:

  • 凝縮物質物理学
  • 量子ガス
  • 超流動性

背景:

  • 第2の音の減衰は 超流動性の重要な現象で 超流動性や臨界現象の理解に不可欠です
  • 均質なフェルミガスを単一性で研究することで,普遍的な量子的批判的行動に関する洞察が得られる.

研究 の 目的:

  • リチウム6原子の均質なフェルミガスにおける二次音の減衰を観察し,特徴づけること.
  • 二次音の拡散性と熱伝導性の温度依存性を調査する.
  • このシステムにおける 重要な現象と量子的批判性を 探求すること

主な方法:

  • 高エネルギー解像度のブラッグ光譜を用いた.
  • 長波長の限界で測定を行った.
  • この実験は,リチウム6原子の均質なフェルミガスに焦点を当てた.

主要な成果:

  • 第2の音の減衰は成功しました
  • 二次音響拡散率と熱伝導性の温度依存性は得られた.
  • 超流体移行温度の約0.95の両方の性質において,臨界分岐の前兆が観察された.
  • 単一フェルミガスは,液体ヘリウムと比較してより大きな臨界領域を示している.

結論:

  • 観測された現象は,単一フェルミガスの重要な振る舞いを洞察する.
  • この結果は,液体ヘリウムよりも単一フェルミガスの重要な領域がかなり大きいことを示唆している.
  • この研究は,量子批判性に近い普遍的な批判的スケーリング関数を決定するための基礎を築きます.