The handle motion is small, allowing the fork to be held by the handle without damping the vibration, but it allows the handle to transmit the vibration to a resonator ( like the hollow rectangular box often used ), which amplifies the sound of the fork.

These signals are very weak at large distances from the lightning source, but the Earth – ionosphere waveguide behaves like a resonator at ELF frequencies and amplifies the spectral signals from lightning at the resonance frequencies.

Stroh violin, or Strohviol, ( Romanian: Vioara cu goarnă ) is a trade name for a horn-violin, or violinophone — a violin that amplifies its sound through a metal resonator and metal horns rather than a wooden sound box as on a standard violin.

The negative resistance of the active device cancels the ( positive ) internal loss resistance in the resonator, in effect creating a resonator with no damping, which generates spontaneous continuous oscillations at its resonant frequency.

The negative resistance of the active device can be thought of as cancelling the ( positive ) effective loss resistance of the resonator, creating sustained oscillations.

The oscillations in a resonator can be either electromagnetic or mechanical ( including acoustic ).

The bunched particles travel in a field-free region where further bunching occurs, then the bunched particles enter the second resonator giving up their energy to excite it into oscillations.

A repeller electrode is provided to repel ( or redirect ) the beam after passage through the resonator back through the resonator in the other direction and in proper phase to reinforce the oscillations set up in the resonator.

The diode cancels the loss resistance of the resonator, so it produces oscillations at its resonant frequency.

Other optical devices, such as spinning mirrors, modulators, filters, and absorbers, may be placed within the optical resonator to produce a variety of effects on the laser output, such as altering the wavelength of operation or the production of pulses of laser light.

Exiting from the windway, the breath is directed against a hard edge ( C ), called the " labium " or " ramp ", which causes the column of air within the resonator tube to oscillate at the desired frequency, determined by the bore length or open tone hole used.

A woodwind instrument is a musical instrument that produces sound when the player blows air against a sharp edge or through a reed, causing the air within its resonator ( usually a column of air ) to vibrate.

Because only a select few wavelengths will be at resonance within the loop, the optical ring resonator functions as a filter.

The light travelling through the waveguides in an optical ring resonator remain within the waveguides due to the ray optics phenomenon known as total internal reflection ( TIR ).

Nitrogen lasers can operate within a resonator cavity,

Dobro is a registered trademark now owned by Gibson Guitar Corporation and used for a particular design of resonator guitar. 1928 Dobro style 37 tenor guitar from Lowell Levinger's collection

The resonator is configured to resonate at a particular frequency ( or frequency band ), thus amplifying sine waves at that radio frequency, while ignoring other sine waves.

Thanks to its low mechanical damping at ordinary temperatures, it is used for high-Q resonators, in particular, for wine-glass resonator of hemispherical resonator gyro ( HRG ).

The crystal mechanically vibrates as a resonator, and its frequency of vibration determines the oscillation frequency.

The player changes the pitch of the sound produced by opening and closing holes in the body of the instrument, thus changing the effective length of the resonator and its corresponding resonant frequency.

Many antenna types are designed to be resonant at their intended frequency of operation ; the driven element functions as a resonator with standing waves of current and voltage along it.

The quality factor or Q factor is a dimensionless parameter that describes how under-damped an oscillator or resonator is, or equivalently, characterizes a resonator's bandwidth relative to its center frequency.

Each bar is paired with a resonator whose diameter is slightly wider than the width of the bar, and whose length to the closure is one-quarter of the wavelength of the fundamental frequency of the bar.

When the bar and resonator are properly in tune with each other, the vibrating air beneath the bar travels down the resonator and is reflected off the closure at the bottom, then returns back to the top and is reflected back by the bar, over and over, creating a much stronger standing wave and amplifying the fundamental frequency.

Usually, either the inductor or the capacitor of the resonator is adjustable, allowing the user to change the frequency at which it resonates.

Sound waves vibrated a diaphragm which slightly altered the shape of the resonator, which modulated the reflected radio frequency.

Of more interest is the frequency separation between any two adjacent modes q and q + 1 ; this is given ( for an empty linear resonator of length L ) by Δν:

In physics and engineering the quality factor or Q factor is a dimensionless parameter that describes how under-damped an oscillator or resonator is, or equivalently, characterizes a resonator's bandwidth relative to its center frequency.

In the context of resonators, Q is defined in terms of the ratio of the energy stored in the resonator to the energy supplied by a generator, per cycle, to keep signal amplitude constant, at a frequency ( the resonant frequency ), f < sub > r </ sub >, where the stored energy is constant with time:

Acoustically, a djembe is a Helmholtz resonator: the frequency of the bass is determined by the size and shape of the shell and independent of the amount of tension on the skin.

Higher levels of integration can be achieved using resonator geometries where the resonant frequency of a ring resonator changes when molecules are absorbed.

If the resonator is inhomogeneous or has a nonrectilinear shape, like a circular drumhead or a cylindrical microwave cavity, the resonant frequencies may not occur at equally spaced multiples of the fundamental frequency.

For both families, the lowest-order solution describes a Gaussian beam, while higher-order solutions describe higher-order transverse modes in an optical resonator.

Each bar is paired with a resonator tube having a motor-driven butterfly valve at its upper end, mounted on a common shaft, which produces a tremolo or vibrato effect while spinning.

Initially the laser medium is pumped while the Q-switch is set to prevent feedback of light into the gain medium ( producing an optical resonator with low Q ).

The zither is played by plucking the strings while it lies flat on a table, which acts as a resonator to amplify the sound.

Open back banjos are normally used for clawhammer and frailing, while those used for bluegrass have the back covered with a resonator.

When the stack is placed at a certain location in the resonator, while having a standing wave in the resonator, a temperature difference can be measured across the stack.

As far as Brazilian berimbaus are concerned, the fruit used for the berimbau's resonator, while still known in Brazil as ' cabaça ', is not technically a gourd ( family Cucurbitaceae ); instead, it is the fruit of an unrelated species, the tree Crescentia cujete ( family Bignoniaceae ), known in Brazil as calabaça, cueira and cuia ( ref.

The resonator is agitated while playing, producing an eerie oscillation of the harmonics.

Modelocking can also be started by shifting the optimum focus from the cw-operation to pulsed operation while changing the power density by kicking the end mirror of the resonator cavity ( though a piezo mounted, synchronous oscillating end-mirror would be more ' turn key ').