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Related Concept Videos

Propagation of Waves01:07

Propagation of Waves

When a wave propagates from one medium to another, part of it may get reflected in the first medium, and part of it may get transmitted to the second medium. In such a case, the interface of the two mediums can be considered as a boundary that is neither fixed nor free.
Consider a scenario where a wave propagates from a string of low linear mass density to a string of high linear mass density. In such a case, the reflected wave is out of phase with respect to the incident wave, however the...
Interference and Diffraction02:18

Interference and Diffraction

Interference is a characteristic phenomenon exhibited by waves. When two electromagnetic waves interact with their peaks and troughs coinciding, a resulting wave with enhanced amplitude is produced. This is known as constructive interference. In this case, the two waves interacting are in phase with each other.
Reflection of Waves01:07

Reflection of Waves

When a wave travels from one medium to another, it gets reflected at the boundary of the second medium. A common example of this is when a person yells at a distance from a cliff and hears the echo of their voice. The sound waves (longitudinal waves) traveling in the air are reflected from the bounding cliff. Similarly, flipping one end of a string whose other end is tied to a wall causes a pulse (transverse wave) to travel through the string, which gets reflected upon reaching the wall. In...
The de Broglie Wavelength02:32

The de Broglie Wavelength

In the macroscopic world, objects that are large enough to be seen by the naked eye follow the rules of classical physics. A billiard ball moving on a table will behave like a particle; it will continue traveling in a straight line unless it collides with another ball, or it is acted on by some other force, such as friction. The ball has a well-defined position and velocity or well-defined momentum, p = mv, which is defined by mass m and velocity v at any given moment. This is the typical...
Sound as Pressure Waves01:17

Sound as Pressure Waves

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...
Standing Waves in a Cavity01:28

Standing Waves in a Cavity

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

Updated: Jun 21, 2026

Measurement of Particle Size Distribution in Turbid Solutions by Dynamic Light Scattering Microscopy
09:16

Measurement of Particle Size Distribution in Turbid Solutions by Dynamic Light Scattering Microscopy

Published on: January 9, 2017

Diffusive waves in a dilating scattering medium.

Jérôme Crassous1, Marion Erpelding, Axelle Amon

  • 1Institut de Physique de Rennes UMR CNRS 6251, Université de Rennes 1, Campus de Beaulieu, F-35042 Rennes Cedex, France. jerome.crassous@univ-rennes1.fr

Physical Review Letters
|August 8, 2009
PubMed
Summary
This summary is machine-generated.

We experimentally show that expanding a scattering material is like shrinking its light wavelength. This effect can be precisely canceled by increasing the wavelength, which is useful for studying material deformation.

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Last Updated: Jun 21, 2026

Measurement of Particle Size Distribution in Turbid Solutions by Dynamic Light Scattering Microscopy
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Published on: January 9, 2017

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08:01

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Area of Science:

  • Optics and photonics
  • Materials science
  • Wave propagation

Background:

  • Diffusive wave propagation in scattering media is crucial for understanding light transport.
  • Characterizing material deformation in disordered samples presents significant challenges.

Purpose of the Study:

  • To investigate the effects of homogeneous material expansion on multiply scattered light.
  • To explore the relationship between material dilation, optical wavelength, and scattered light properties.
  • To demonstrate a method for canceling the impact of material expansion on scattered waves.

Main Methods:

  • Experimental measurement of multiply scattered light from a glass spheres sample.
  • Analysis of scattered light variations under simultaneous material and optical wavelength dilation.
  • Controlled manipulation of material expansion and wavelength to observe phase changes.

Main Results:

  • An isotropic expansion of the scattering medium was shown to be equivalent to a contraction of the optical wavelength.
  • It was experimentally demonstrated that material expansion effects on scattered light can be nullified by a proportional wavelength increase.
  • The phase of the scattered wave remained unchanged when expansion and wavelength changes were balanced.

Conclusions:

  • Material expansion and wavelength changes have predictable and controllable effects on diffusive wave propagation.
  • This phenomenon offers a novel approach for characterizing the deformation of disordered materials.
  • The findings have potential applications in non-destructive testing and material analysis.