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Related Concept Videos

Sound Waves01:01

Sound Waves

9.7K
Sound waves can be thought of as fluctuations in the pressure of a medium through which they propagate. Since the pressure also makes the medium's particles vibrate along its direction of motion, the waves can be modeled as the displacement of the medium's particles from their mean position.
Sound waves are longitudinal in most fluids because fluids cannot sustain any lateral pressure. In solids, however, shear forces help in propagating the disturbance in the lateral direction as well....
9.7K
Sound as Pressure Waves01:17

Sound as Pressure Waves

2.7K
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.
The pressure fluctuation depends on the difference in displacements between the successive points in the...
2.7K
Perception of Sound Waves01:01

Perception of Sound Waves

4.8K
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...
4.8K
Speed of Sound in Solids and Liquids00:51

Speed of Sound in Solids and Liquids

3.3K
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...
3.3K
Sound Waves: Resonance01:14

Sound Waves: Resonance

2.8K
Resonance is produced depending on the boundary conditions imposed on a wave. Resonance can be produced in a string under tension with symmetrical boundary conditions (i.e., has a node at each end). A node is defined as a fixed point where the string does not move. The symmetrical boundary conditions result in some frequencies resonating and producing standing waves, while other frequencies interfere destructively. Sound waves can resonate in a hollow tube, and the frequencies of the sound...
2.8K
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...
4.0K

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Related Experiment Video

Updated: Oct 13, 2025

Using Eye Movements Recorded in the Visual World Paradigm to Explore the Online Processing of Spoken Language
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Using Eye Movements Recorded in the Visual World Paradigm to Explore the Online Processing of Spoken Language

Published on: October 13, 2018

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Why Not a Sound Postulate?

Bryan Cheng1, James Read1

  • 1University of Oxford, Oxford, UK.

Foundations of Physics
|November 11, 2021
PubMed
Summary
This summary is machine-generated.

This study explores a hypothetical "sonic relativity" by replacing light

Keywords:
Analogue gravityLorentz invarianceSound postulateSpecial relativityWaves

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Area of Science:

  • Relativity
  • Philosophy of Physics
  • Acoustics

Background:

  • Einstein's 1905 special relativity is built on a light postulate.
  • The historical reasons for focusing on light are reviewed.

Purpose of the Study:

  • To investigate replacing the light postulate with a sound postulate.
  • To explore the empirical justification for "sonic relativity."
  • To examine the philosophical implications of "sonic relativity."

Main Methods:

  • Historical review of special relativity's foundations.
  • Conceptual analysis of a hypothetical "sonic relativity."
  • Philosophical examination of spacetime theories.

Main Results:

  • The study identifies historical reasons for light's central role.
  • It outlines conditions for empirical justification of sonic relativity.
  • It analyzes philosophical consequences for spacetime theories.

Conclusions:

  • Replacing light with sound in relativity presents unique challenges and insights.
  • Sonic relativity offers a novel lens for contemporary philosophy of spacetime.
  • The study prompts re-evaluation of fundamental assumptions in physics and philosophy.