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Related Concept Videos

Sound as Pressure Waves01:17

Sound as Pressure Waves

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Sound waves, which are longitudinal waves, can be modeled as the displacement amplitude varying as a function of the spatial and temporal coordinates. As a column of the medium is displaced, its successive columns are also displaced. As the successive displacements differ relatively, a pressure difference with the surrounding pressure is created. The gauge pressure varies across the medium.
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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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Perception of Sound Waves01:01

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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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Sound Intensity00:58

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The loudness of a sound source is related to how energetically the source is vibrating, consequently making the molecules of the propagation medium vibrate. To measure the loudness of a source, the physical quantity of interest is the intensity. This is defined as the energy emitted per unit of time per unit of area perpendicular to the sound wave's propagation direction. Since the total energy is greater if the source vibrates for a longer duration and over a larger area, dividing the...
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Sound Intensity Level00:53

Sound Intensity Level

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Humans perceive sound by hearing. The human ear helps sound waves reach the brain, which then interprets the waves and creates the perception of hearing. The loudness of the environment in which a person is located determines whether they can distinguish between different sound sources.
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Updated: Oct 21, 2025

Author Spotlight: Development of a Scaffold-Free Acoustic Assembly Method for High-Quality 3D Cell Spheroid Culture
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Three-Dimensional Soundproof Acoustic Metacage.

Chenkai Liu1,2, Jinjie Shi1, Wei Zhao2,3

  • 1MOE Key Laboratory of Modern Acoustics, National Laboratory of Solid State Microstructures, School of Physics, and Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing 210093, China.

Physical Review Letters
|September 3, 2021
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Summary
This summary is machine-generated.

This study introduces a novel acoustic metacage for low-frequency soundproofing. The structure effectively blocks sound even with airflow, offering solutions for ventilated spaces.

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Area of Science:

  • Acoustics
  • Materials Science
  • Metamaterials

Background:

  • Low-frequency soundproofing is challenging, especially in applications requiring ventilation.
  • Existing acoustic structures often struggle with airflow perturbations.
  • Metamaterials offer unique acoustic properties but require novel designs for practical applications.

Purpose of the Study:

  • To theoretically propose and experimentally demonstrate a three-dimensional soundproof acoustic cage (acoustic metacage).
  • To investigate a novel mechanism for creating low-frequency band gaps using acoustic metamaterials.
  • To assess the robustness of the acoustic metacage against airflow.

Main Methods:

  • Theoretical proposal and experimental demonstration of the acoustic metacage structure.
  • Band structure analysis to identify the physical mechanism for soundproofing.
  • Transmission loss measurements using simulations and an acoustic impedance tube.
  • Testing the structure's performance under airflow perturbation.

Main Results:

  • A novel physical mechanism for opening a low-frequency broad partial band gap was revealed via band folding.
  • The acoustic metacage demonstrated significant transmission loss in simulations and experiments.
  • The soundproofing effect was proven robust against airflow perturbation from a fan.

Conclusions:

  • The developed acoustic metacage provides effective low-frequency soundproofing.
  • The structure's robustness against airflow makes it suitable for applications with ventilation.
  • This work advances the development of practical low-frequency airborne soundproof structures.