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Sound Waves: Resonance01:14

Sound Waves: Resonance

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...
Double Resonance Techniques: Overview01:12

Double Resonance Techniques: Overview

Double resonance techniques in Nuclear Magnetic Resonance (NMR) spectroscopy involve the simultaneous application of two different frequencies or radiofrequency pulses to manipulate and observe two distinct nuclear spins. One important application of double resonance is spin decoupling, which selectively suppresses coupling with one type of nucleus while observing the NMR signal from another nucleus, simplifying the spectrum and enhancing resolution.
Spin decoupling is usually achieved by...
Parallel Resonance01:23

Parallel Resonance

The parallel RLC circuit is an arrangement where the resistor (R), inductor (L), and capacitor (C) are all connected to the same nodes and, as a result, share the same voltage across them. The parallel RLC circuit is analyzed in terms of admittance (Y), which reflects the ease with which current can flow. The admittance is given by:
Concept of Resonance and its Characteristics01:19

Concept of Resonance and its Characteristics

If a driven oscillator needs to resonate at a specific frequency, then very light damping is required. An example of light damping includes playing piano strings and many other musical instruments. Conversely, to achieve small-amplitude oscillations as in a car's suspension system, heavy damping is required. Heavy damping reduces the amplitude, but the tradeoff is that the system responds at more frequencies. Speed bumps and gravel roads prove that even a car's suspension system is not immune...
Resonance02:52

Resonance

The Lewis structure of a nitrite anion (NO2−) may actually be drawn in two different ways, distinguished by the locations of the N-O and N=O bonds.
Resonance and Hybrid Structures02:16

Resonance and Hybrid Structures

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.
Resonance Structures and Resonance Hybrids
The Lewis structure of a nitrite anion (NO2−) may actually be drawn in two different ways, distinguished by the locations of the N–O and N=O bonds.

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Related Experiment Video

Updated: Jun 20, 2026

Uncovering Hidden Dynamics of Natural Photonic Structures Using Holographic Imaging
05:45

Uncovering Hidden Dynamics of Natural Photonic Structures Using Holographic Imaging

Published on: March 31, 2022

Near-resonant holography.

L F Rubin, D M Swain

    Optics Letters
    |September 24, 2009
    PubMed
    Summary

    A new two-wavelength holography technique accurately measures species concentration by recording refractive-index differences. This method effectively subtracts nonresonance aberrations for precise atomic sodium measurements.

    Area of Science:

    • Optical Physics
    • Spectroscopy
    • Chemical Measurement

    Background:

    • Accurate species concentration measurement is crucial in various scientific fields.
    • Holography offers advanced optical measurement capabilities.
    • Atomic species present unique spectroscopic challenges.

    Purpose of the Study:

    • To introduce and validate a novel two-wavelength holography technique.
    • To measure species concentration using laser-induced refractive-index differences.
    • To address and mitigate aberrations in holographic measurements.

    Main Methods:

    • Utilizing two pulsed dye-laser wavelengths tuned to the near-resonant region of atomic sodium.
    • Recording the refractive-index difference between the two wavelengths on a hologram.

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    Compact Lens-less Digital Holographic Microscope for MEMS Inspection and Characterization

    Published on: July 5, 2016

    Digital Inline Holographic Microscopy (DIHM) of Weakly-scattering Subjects
    10:16

    Digital Inline Holographic Microscopy (DIHM) of Weakly-scattering Subjects

    Published on: February 8, 2014

    Related Experiment Videos

    Last Updated: Jun 20, 2026

    Uncovering Hidden Dynamics of Natural Photonic Structures Using Holographic Imaging
    05:45

    Uncovering Hidden Dynamics of Natural Photonic Structures Using Holographic Imaging

    Published on: March 31, 2022

    Compact Lens-less Digital Holographic Microscope for MEMS Inspection and Characterization
    10:28

    Compact Lens-less Digital Holographic Microscope for MEMS Inspection and Characterization

    Published on: July 5, 2016

    Digital Inline Holographic Microscopy (DIHM) of Weakly-scattering Subjects
    10:16

    Digital Inline Holographic Microscopy (DIHM) of Weakly-scattering Subjects

    Published on: February 8, 2014

  • Implementing a method to subtract nonresonance aberrations for small wavelength differences.

    • Main Results:

    • Successfully demonstrated experimental results of the new technique.
    • The technique records the refractive-index difference between specific laser wavelengths.
    • Nonresonance aberrations were effectively subtracted for improved accuracy.

    Conclusions:

    • The developed two-wavelength holography technique is effective for species concentration measurement.
    • This method provides a way to precisely measure atomic sodium concentrations.
    • The aberration subtraction is key to the technique's accuracy.