Sympathetic string
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Sympathetic strings or resonance strings are auxiliary strings found on many Indian musical instruments, as well as some Western Baroque instruments and a variety of folk instruments.
Hardanger fiddle, showing sympathetic strings underneath playing strings
Detail of a sarangi, showing its sympathetic strings under three playing strings
Resonance
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Resonance is a phenomenon that occurs when an object or system is subjected to an external force or vibration whose frequency matches a resonant frequency of the system, defined as a frequency that ge
Sympathetic string
…which resolves the imbalance of resonance on the guitar. By adding the abovementioned resonances and, of course, their fifths (the fifth being a strong resonant frequency)—that is to say, G, F, D♯, C♯—the guitar's strings now resonate more equally with all 12 notes of the chromatic scale, bringing the guitar's sound…
Pushing a person in a swing is a common example of resonance. The loaded swing, a pendulum, has a natural frequency of oscillation, its resonant frequency, and resists being pushed at a faster or slower rate.
School resonating mass experiment
NMR Magnet at HWB-NMR, Birmingham, UK. In its strong 21.2-tesla field, the proton resonance is at 900 MHz.