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Sound Waves: Resonance

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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...

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According to the theory of resonance, if two or more Lewis structures with the same arrangement of atoms can be written for a molecule, ion, or radical, the actual distribution of electrons is an average of that shown by the various Lewis structures.
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Resonance

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Updated: Jun 17, 2026

Scattering And Absorption of Light in Planetary Regoliths

Scattering And Absorption of Light in Planetary Regoliths

Published on: July 1, 2019

Resonance scattering from absorbing spheres.

G W Kattawar¹, G N Plass

¹North Texas State University,Denton, Texas 76203, USA.

|January 12, 2010

Summary

Introducing absorption to spheres significantly alters electromagnetic scattering near resonance. Resonance peaks decrease, and scattering patterns shift from forward to backward depending on refractive index and size parameters.

Area of Science:

Electromagnetic theory
Optical physics
Materials science

Background:

Understanding electromagnetic scattering is crucial for various applications.
Resonances in scattering phenomena exhibit unique optical properties.
The role of absorption in modifying scattering behavior requires detailed investigation.

Purpose of the Study:

To investigate electromagnetic scattering from absorbing spheres near resonance.
To analyze the impact of refractive index components on scattering efficiency and angular distribution.
To elucidate the relationship between absorption and scattering characteristics.

Main Methods:

Numerical calculations of the efficiency factor for extinction (Qext).
Analysis of angular scattering functions.

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Last Updated: Jun 17, 2026

Scattering And Absorption of Light in Planetary Regoliths

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Published on: July 1, 2019

Stimulated Stokes and Antistokes Raman Scattering in Microspherical Whispering Gallery Mode Resonators

Stimulated Stokes and Antistokes Raman Scattering in Microspherical Whispering Gallery Mode Resonators

Published on: April 4, 2016

Resonance Raman Spectroscopy of Extreme Nanowires and Other 1D Systems

Resonance Raman Spectroscopy of Extreme Nanowires and Other 1D Systems

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Systematic variation of real (n1) and imaginary (n2) parts of the refractive index.

Main Results:

The maximum extinction efficiency at the first resonance decreases sharply with minimal absorption.
Resonance width dependence on refractive indices changes with and without absorption.
Scattered intensity near resonance shifts from forward to backward scattering based on size parameter relative to resonance.
Forward scattering intensity initially increases then decreases with increasing absorption for specific conditions.
Strong forward and backward scattering observed on either side of resonance.

Conclusions:

Absorption significantly modifies resonant scattering behavior in spheres.
The interplay between refractive index and size parameter governs scattering directionality.
Resonance phenomena in absorbing spheres offer tunable optical responses.