Resonance

(noun)

The amplication of vibration by the structures of the upper respiratory tract, which can also influence the quality or tone of the sound.

Related Terms

Examples of Resonance in the following topics:

  • Notes

  • Resonance

    • Resonance structures depict possible electronic configurations; the actual configuration is a combination of the possible variations.
    • This intermediate has an overall lower energy than each of the possible configurations and is referred to as a resonance hybrid.
    • Therefore, three valid resonance structures can be drawn.
    • Sometimes, resonance structures involve the placement of positive and negative charges on specific atoms.
    • Because atoms with electric charges are not as stable as atoms without electric charges, these resonance structures will contribute less to the overall resonance structure than a structure with no charges.

  • Resonance in RLC Circuits

    • Resonance is the tendency of a system to oscillate with greater amplitude at some frequencies than at others.
    • $\nu_0$ is the resonant frequency of an RLC series circuit.
    • Resonance in AC circuits is analogous to mechanical resonance, where resonance is defined as a forced oscillation (in this case, forced by the voltage source) at the natural frequency of the system.
    • A variable capacitor is often used to adjust the resonance frequency to receive a desired frequency and to reject others. is a graph of current as a function of frequency, illustrating a resonant peak in Irms at $\nu_0 = f_0$.
    • Both have a resonance at f0, but that for the higher resistance is lower and broader.

  • NMR and MRIs

    • Magnetic resonance imaging is a medical imaging technique used in radiology to visualize internal structures of the body in detail.
    • Magnetic resonance imaging (MRI), also called nuclear magnetic resonance imaging (NMRI) or magnetic resonance tomography (MRT), is a medical imaging technique used in radiology to visualize internal structures of the body in detail.
    • MRI utilized the property of nuclear magnetic resonance (NMR) to image the nuclei of atoms inside the body.
    • This electromagnetic field has just the right frequency (known as the resonance frequency) to become absorbed and then reverse the rotation of the hydrogen protons in the magnetic field.

  • Forced Vibrations and Resonance

    • The phenomenon of driving a system with a frequency equal to its natural frequency is called resonance.
    • The phenomenon of driving a system with a frequency equal to its natural frequency is called resonance.
    • It is interesting that the widths of the resonance curves shown in depend on damping: the less the damping, the narrower the resonance.
    • In all of these cases, the efficiency of energy transfer from the driving force into the oscillator is best at resonance.
    • Heavy cross winds drove the bridge into oscillations at its resonant frequency.

  • Acidity of Phenols

    • A similar set of resonance structures for the phenolate anion conjugate base appears below the phenol structures.
    • The resonance stabilization in these two cases is very different.
    • An important principle of resonance is that charge separation diminishes the importance of canonical contributors to the resonance hybrid and reduces the overall stabilization.
    • An energy diagram showing the effect of resonance on cyclohexanol and phenol acidities is shown below.
    • The additional resonance stabilization provided by ortho and para nitro substituents will be displayed in the third diagram above.

  • Resonance

    • Likewise, the structure of nitric acid is best described as a resonance hybrid of two structures, the double headed arrow being the unique symbol for resonance.
    • The above examples represent one extreme in the application of resonance.
    • The application of resonance to this case requires a weighted averaging of these canonical structures.
    • The basic principles of the resonance method may now be summarized.
    • The stability of a resonance hybrid is always greater than the stability of any canonical contributor.

  • Standing Waves in Air Columns

    • We use specific terms for the resonances in any system.
    • The lowest resonant frequency is called the fundamental, while all higher resonant frequencies are called overtones.
    • Now let us look for a pattern in the resonant frequencies for a simple tube that is closed at one end.
    • The resonant frequencies of a tube closed at one end are:
    • Simple resonant cavities can be made to resonate with the sound of the vowels, for example.

  • Establishing a resonating frame for businesses

  • Reactions of Fused Benzene Rings

    • Naphthalene is stabilized by resonance.
    • Three canonical resonance contributors may be drawn, and are displayed in the following diagram.
    • From heats of hydrogenation or combustion, the resonance energy of naphthalene is calculated to be 61 kcal/mole, 11 kcal/mole less than that of two benzene rings (2 * 36).
    • As expected from an average of the three resonance contributors, the carbon-carbon bonds in naphthalene show variation in length, suggesting some localization of the double bonds.